How can scientific validity be ensured?
More variables under control, better measurement methods, more randomization to avoid sample bias, experiment blinding, and the addition of control or placebo groups can all help an experiment's validity.
What determines the reliability of scientific data?
How well a method measures what it is supposed to measure is known as its validity. When a study's findings are highly valid, it means that they accurately reflect the genuine features, traits, and variations in the physical or social reality. High dependability is one sign of a valid measurement.
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The bicoid gene product is normally localized to the anterior end of the embryo. If large amounts of the product were injected into the posterior end as well, which of the following would occur?
Anterior structures would form in both sides of the embryo.
The embryo would grow to an unusually large size.
The embryo would probably show no anterior development and die.
The embryo would grow extra wings and legs.
If large amounts of the product were injected into the posterior end as well, the option that would occur is option A: Anterior structures would form in both sides of the embryo.
What happens to an embryo with a mutated bicoid gene?The Head and thorax are said to be absent from female embryos with a bicoid mutation, and they are known to have been replaced by a posterior telson as stated by Fröhnhofer in 1986.
Noe that At the blastoderm stage, ems and btd expression are reduced and shifted anteriorly in embryos missing both maternal and zygotic HB.
Since it allowed animals to move unidirectionally, the anterior-posterior (AP) axis was the first embryonic axis to emerge in evolutionary time.
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What does the
prefix "bio" mean?
A. study of
B. biotic
C. life
D. grow
Answer:
What does bio- mean? The combining form bio– is used like a prefix meaning “life.” It is often used in scientific terms, especially in biology. The form bio– comes from Greek bíos, meaning “life.” The Latin cognate of bíos is vīta, “life,” which is the source of words such as vital.
Denise was measuring the effect of temperature on the amount of dissolved oxygen that water can hold. She hypothesized that as water temperature increases, the amount of oxygen that is dissolved in water increases. Her data are shown in the table below.
The conclusion that Denise is most likely to write in her lab report is as follows: the data did not support the hypothesis because the amount of dissolved oxygen decreased as water temperature increased (option A).
What is a hypothesis?Hypothesis in an investigation is the tentative conjecture explaining an observation, phenomenon or scientific problem that can be tested by further observation, investigation and/or experimentation.
According to this question, Denise was performing an experiment on the effect of temperature has on the amount of dissolved oxygen that water can hold.
She then constructs an hypothesis as follows: "water temperature increases, the amount of oxygen that is dissolved in water increases"
However, the data given in the results showed that as temperature increases, the amount of dissolved oxygen decreases. Therefore, it can be said that Denise's data did not support her hypothesis.
The complete question is as follows:
Which conclusion did Denise most likely write in her lab report?
The data did not support the hypothesis because the amount of dissolved oxygen decreased as water temperature increased
The data did not support the hypothesis because the amount of dissolved oxygen increased as water temperature increased
The data supported the hypothesis because the amount of dissolved oxygen decreased as water temperature increased
The data supported the hypothesis because the amount of dissolved oxygen increased as water temperature decreased
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1) Why does it pay to buy fire insurance for your home even though
you may never have a fire?
Answer:
because what if u had a fire at ur home bro :)
HELP ASAP, this is for k12 bio
Answer: The correct answer is the first one.
A. The alveolus is a part of the lung and assists with gas exchange. The goal is to get gases into and out of the cells, so they enter our body, go to our lungs and then diffuse into our blood and travel to our cells through our circulatory system.
What is the process of weighing the pros and cons of different alternatives and making a choice?
A.
problem solving
B.
analogical reasoning
C.
decision making
D.
mental simulations
The process of weighing the pros and cons of different alternatives and making a choice is decision-making. Option C.
Decision-making is the process of making decisions by identifying decisions, gathering information, and evaluating alternative solutions. A step-by-step decision-making process helps you make more conscious and thoughtful decisions by organizing relevant information and defining alternatives.
Quantification options help you review your decisions. Record the potential benefits of your approach in the Pros column and potential negative outcomes in the Cons column. Then evaluate the strengths and weaknesses to show the importance of each. Considering the worst-case scenarios and possible issues with each decision is a good way to understand the strengths and weaknesses of different decisions.
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How do the muscular and skeletal systems work together to make the human body move? A. They provide nutrients to the body B. They provide oxygen and carbon dioxide to the body C. The provide blood to the body D. They provide structure and movement to the body
The muscular and skeletal systems work together to make the human body move as: D. They provide structure and movement to the body.
The muscular and skeletal system is also known as the musculoskeletal system. The bones of our skeletal system work on protecting the body's organs, support the weight of our body and provides shape to our body. The muscles of the muscular system which are attached to these bones, pull on them to allow the movement of the body.
The muscles in our body can pull the bones, but they can't push them back to their original position. Therefore, they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint. After the movement is complete, the flexor relaxes and the extensor contracts to straighten the limb at the same joint.
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In total, how many CO2, ATP, NADH, and FADH2 are produced from the acetyl CoAs in the citric acid cycle?
Answer choices shown in picture
Correct answer is option (A) and (D) 2CO₂, 1ATP, 3NADH, 1FADH₂ are produced from the acetyl CoA in citric acid cycle.
The 8 steps of the citric acid cycle are a series of redox, dehydration, hydration, and decarboxylation reactions. Every flip of the cycle bureaucracy one GTP or ATP as well as three NADH molecules and one FADH2 molecule, to be able to be used in further steps of mobile breathing to provide ATP for the cell.
The citric acid cycle, the Krebs cycle or TCA cycle is a sequence of reactions occurring in the mitochondria, thru which almost all dwelling cells produce electron in aerobic respiration. It makes use of oxygen and gives out water and carbon dioxide as merchandise. here, ADP is transformed into ATP.
The citric acid cycle presents the electrons that fuel the technique of oxidative phosphorylation our primary source of ATP and energy. As the acetyl group is damaged down, electrons are saved in the carrier NADH, and added to complex I.
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question is in the image provided
Answer: The correct answer is B. ADP + P --> ATP
Explanation: ADP is combined with a phosphate to form ATP in the reaction ADP+Pi+free energy→ATP+H2O.
"'Pardon, O King,' cried the little Mouse: 'forgive me this time, I shall never forget it: who knows but what I may be able to do you a turn some of these days?' The Lion was so tickled at the idea of the Mouse being able to help him, that he lifted up his paw and let him go." (paragraph 31)
What does the word tickled suggest about the Lion?
A
He is amused by the Mouse's offer to help him.
B
He is interested in the Mouse's ability to bargain.
C
He is pleased by feeling the Mouse under his paw.
D
He is very happy about the Mouse's request for help.
Answer:
the answer is B
Explanation:
"The lion was so tickled at the idea of the mouse being able to help him " We can see that the lions is amused cuz here it says "at the idea of the mouse being able to help him" so he is actually Abt it
The element which forms the backbone of all organic molecules is: PLEASE HELPPPP
Answer: Organic chemistry based on compounds in which (Carbon) is a central element. The properties of carbon make it the backbone of the organic molecules which form
Explanation: The fundamental component for all of these macromolecules is carbon. The carbon atom has unique properties that allow it to form covalent bonds to as many as four different atoms, making this versatile element ideal to serve as the basic structural component, or “backbone,” of the macromolecules.
Answer: Carbon
Explanation:
Drag each tile to the correct location.
Label the layers of Earth's interior. If you don't know the name of a layer
The outermost layer is called as Crust. The middle layer is called as Mantle and the last layer is called as The Core. This core is further divided into two parts namely Inner core and Outer core.
The four strata of EarthEarth has four distinct strata. According to geologists, when the Earth cooled, the denser, heavier material sank to the center and the lighter material rose to the surface.
Because of this, the innermost layer is composed of nickel and iron, and the outermost layer is formed of the lightest materials, such rocks and granite.
The Layers of EarthThe four layers of the earth are its inner core, outer core, mantle, and crust. The crust, mantle, and core are the three major layers of the planet.
Despite making up only 16.1% of the planet’s volume, the core accounts for over half of its radius. Only a little portion (1.4%) of Earth’s total volume (82.5%) is made up of its crust.
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The smooth ER differs from the rough ER in that:
A. The rough ER contains no ribosomes, the smooth ER contains ribosomes.
B. The smooth ER produces carbohydrates and lipids, rough ER produces proteins.
C. The smooth ER produces proteins, rough ER produces lipids.
D. The rough ER is the site of mRNA transcription, smooth ER is the site of protein translation.
Answer:
B
Explanation:
the correct answer is B. Smooth ER are found in cells that participate in liptid metabolism and detoxify the body and rough ER is involved in protein production
Q1. In a sound wave what is a region of high pressure known as?
Q2.Name a wave that does not need a material to travel
Q3.Why does sound travel faster in solids as compared to liquids and faster in liquid as compared to gases?
Answer:
1. In a sound wave what is a region of high pressure known as?
These regions are known as compressions and rarefactions respectively. The compressions are regions of high air pressure while the rarefactions are regions of low air pressure.
2. Name a wave that does not need a material to travel
An electromagnetic wave can travel through anything - be it air, a solid material or vacuum. It does not need a medium to propagate or travel from one place to another.
3. Why does sound travel faster in solids as compared to liquids and faster in liquid as compared to gases?
This is because the molecules of solids are more tightly packed together than in liquids and those in liquids are more tightly packed than in gases. Vibrating effects are more easily passed on from one molecule to the next when they are in close proximity.
Explanation:
Hope it helps! =D
The Principal of Hillside High School is concerned about the high levels of lateness and absenteeism among students. She is considering adopting either an autocratic or participatory approach to solving these issues.
Explain how the principal could use an autocratic approach to address the issues
Answer:
the principal will enforce rules on the students that practice such acts and the ones that are not following said rules the rules can be a variety of this such as :
if late or absent more that three times a semester the students will have their parents sing a paper informing that the have to come to the school and the student will have to stay in after school detention for the days that they have skipped and if they don't bring the paper to the parents, their sentence will double.
hope that helps
name three important factors that can effect the rate of photosynthesis
Answer:
light intensity, carbon dioxide concentration and temperature.
Explanation:
which system is responsible for beathing
a representation of an object , system , or process is called?
A representation of an object, system, or process is called a model.
A model is a representation of an idea object or even process or system used to describe and explain phenomena that cannot be directly experienced. Models are central to the work of scientists both in research and in communicating explanations.
Scientific models are used to describe and predict the behavior of real-world objects and systems and are used in many scientific disciplines from physics and chemistry to ecology and earth sciences. The main types of scientific models are visual models, mathematical models, and computer models. A model of the movement of the sun moon and earth that I participated in last year. A model for predicting solar eclipses. Models that describe weather phenomena can be used for weather forecasting.
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Which means of particle transport is shown in the figure below?
Answer
A diffusion
B) osmosis
C) active transport
D facilitated diffusion
Therefore, D, which stands for facilitated diffusion, will be the answer to this issue. Thus, one transport protein carries the molecules from across the membrane during assisted diffusion.
Active transport is affected by what particles?The process that includes the of pumping molecules and ions across membranes in “uphill” direction – against a concentration gradient – is known as active transport.
Transport proteins that are present in the membrane are typically responsible for the active transport of small molecules or ions across a cell membrane.
Do you mean active or passive aided diffusion?Passive transport can be said as a subset of facilitated diffusion.
Because the solution is going down the concentration gradient, assisted diffusion is still passive transport and when it incorporates transport proteins. The cell can easily disperse small nonpolar compounds.
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A cell is a system of parts that work together to carry out basic life processes. An animal is also a system of parts that work together to carry out basic life processes. Match each organ or organ system with the cell part that has a similar function.
Answer:
Nucleus - brain
cell membrane - skeletal system
mitochondria - digestive system
cell wall - skin
Explanation:
hope that helps!
What has become the biggest
threat to biodiversity?
A. limited resources
C. habitat loss
B. extinction
D. pollution
Answer:
Extinction has become the biggest threat to biodiversity
What are your thoughts on psychoneuroimmunology?
Answer:
Psychoneuroimmunology is the study of how your immune system and your central nervous system interact. Psychological stress makes you more susceptible to everything from the common cold to flare-ups of autoimmune diseases.
Decide whether the attribute describes Earth, Venus, or both Earth and Venus.
has a rocky,
experiences retrograde
experiences the
metallic composition
rotation, spinning
greenhouse effect,
clockwise as viewed
which warms the planet
from above
is the densest planet
iS located an ideal
is one of the brightest
in the solar system
distance from the
objects in the night sky,
Sun, allowing it to
sometimes mistaken
support life
for a star
Earth
Both
Venus
These describe the features of both Earth and Venus with the provided attributes that point towards a mix of attributes of both the planets.
Explain what the Earth is.The elements of Earth are all known as land, air, water, and life. Mountains, valleys, and flat places, all these can be found on the ground. Different kinds of gases, such as nitrogen and oxygen, make up the air. Rain, snow, ice, rivers, lakes, oceans, and streams all these can be taken as all examples of water.
With a total of 50-million-year margin of error, the age of the Earth can be calculated to be as 4.54 billion years. In order to radiometrically take up and date the oldest rocks, scientists have already combed the entire planet.
VenusThe planet Venus, which orbits the Sun as its closest to Earth, is the second planet from Sun. Because this is nearly as big as Earth and along with it also shares many of its characteristics, it is frequently referred to as Earth's "twin" planet.
Distance from Sun: 108.2 million km
Radius: 6,051.8 km
Surface area: 460.2 million km²
Density: 5.24 g/cm³
Mass: 4.867 × 10^24 kg (0.815 M⊕)
Length of day: 116d 18h 0m
Orbital period: 225 days
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Complete Question
Decide whether the attribute describes Earth, Venus, or both Earth and Venus. Match the following with earth, venus, or both.
1) Has a rocky, metallic composition
2) Experiences retrograde rotation, spinning clockwise as viewed from above
3) Experiences the greenhouse effect, which warms the planet
4) Is the densest planet in the solar system
5) Is located an ideal distance from the Sun, allowing it to support life
6) Is one of the brightest objects in the night sky, sometimes mistaken for a star
Why do we eat fruit??
Answer:
It is yummy, tasty and healthy~
Explanation:
Calculate the population growth for the following scenario. Over the course of a year, a population of 25 penguins gained 5 penguins through births and lost 3 penguins to death. In addition, 10 adult penguins moved into the population through immigration and 6 adult penguins moved out of the population through emigration. What is the yearly growth rate of this population?
Yearly growth rate is 6.
Population increases by Birth and immigration. Population decreases by death and emigrations .so, yearly growth rate of this population from births and immigration provides the growth rate of a population over a given period of time.
Birth immigration 5+10,6+3
Yearly growth rate is 15-9=6
Population growth is the increase in the number of people in a population or dispersed group. To calculate the Population Growth (PG) we find the difference (subtract) between the initial population and the population at Time 1, then divide by the initial population and multiply by 100.
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Hugo was asked to diagram sentences for his English class when he comes across the prefix “pre.” What is a prefix an example of what?
A.
phrase
B.
phoneme
C.
morpheme
D.
language protocol
Prefix an example of the phrase.
Prefixes are usually added directly to the base word, but there are some cases where a hyphen is required. When adding prefixes to proper nouns or numbers, hyphenate the word. Split words when adding the prefix ex. This means before. An affix added to the beginning of a word, base, or sentence that helps generate derivations or inflections. Compare with suffix. A title that precedes a person's name.
A prefix is a group of characters or affixes added to the beginning of a word. A prefix changes the meaning of a word. You can negate a word, indicate repetition, or hint at an opinion. When adding a prefix to a word, do not change the spelling of the original word or prefix. A prefix is a letter or group of letters that you add to the beginning of a word. Prefixes change the meaning of words.
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How do O2 levels change during the day?
Your SpO2 may fluctuate during the day, especially when going from a low-energy state to a high-energy state. These variations, your SpO2 remains within a reasonable range, therefore there is no need for alarm.
Why are oxygen levels important?Similar to a person's blood pressure or body temperature, many people believe that an individual's oxygen level is a crucial indicator of how well their body is functioning. According to their doctor's instructions, people with lung or heart conditions can use a pulse oximeter at home to monitor their health.
What happen when oxygen level is low?You may experience headache, disorientation, or restlessness when your blood oxygen level drops below a specific point. Anemia is one of the typical causes of hypoxemia. (Acute respiratory distress syndrome)
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Regular exercise reduces the risk for cardiovascular diseases by
Group of answer choices
thinning the blood.
increasing flexibility.
decreasing lung capacity.
strengthening the heart muscle.
Regular exercise reduces the risk of cardiovascular diseases by strengthening the heart muscles. So the correct option is D.
What are the benefits of regular exercise?One of the most crucial things you can do for your health is to exercise regularly. Physical activity may strengthen your bones and muscles, help you maintain a healthy weight, increase your ability to carry out daily tasks and improve your cognitive health.
Adults who spend less time sitting and engage in any level of moderate-to-vigorous exercise reap some health advantages. Physical activity has a greater influence on your health than very few other lifestyle decisions.
Physical activity has health advantages for everyone; age, ability, ethnicity, form, or size are irrelevant. Following a session of moderate-to-vigorous exercise, physical activity has some positive effects on brain health. Children aged 6 to 13 will experience better thinking or cognition and adults will have less transient anxiety.
As you age, staying physically active on a regular basis might help keep your thinking, learning, and judgment abilities sharp. Additionally, it can improve your quality of sleep and lower your risk of anxiety and sadness.
Therefore the correct option is D.
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pls help i dont get it
Smithers thinks that a special juice will increase the productivity of two groups of
50 workers. He creates two groups of 50 workers each and assigns each group
the same task (in this case, they're supposed to staple a set of papers). Group A is
given the special juice to drink while they work. Group B is not given the special
juice. After an hour, Smithers counts how many stacks of papers each group has
made. Group A made 1,587 stacks, Group B made 2,113 stacks.
Use this scenario to answer questions 1-4
1. Identify the control group
A: Group A
B: Group B
C: There is no control group
2. Identify the independent variable
a: Amount of pages stapled
b: Special Juice
c: Stapler
3. Identify the dependent variable*
a: Special Juice
b: Stapler
c: Amount of pages stapled
4. What should Smithers conclusion be?
a: Group A made 1,587 stacks and Group B made 2,113 stacks of paper therefore the special drink DID work
b :There isn't enough evidence to make a conclusion
c: Group A made 1,587 stacks and Group B made 2,113 stacks of paper therefore the special drink DID NOT work
Answer:
bbcc
Explanation:
1.)Group B wasn't given anything to effect their productivity.
2.)The special juice is not effected by other factors.
3.)The amount of pages stapled is directly affected by the special juice variable
4.)The point of the special juice was to increase productivity, since the group with the special juice was less productive than the group without it the special juice failed.
1.this part of the brain controls the beating of the heart
a.spinal cord b.cerebrum c.cerebellum d.main stem
2. tiny connections or pathways in the nervous system are called ___
a.blood cells b. neurons c.brain tissues d.tiny cells sites
3. sounds enter the ear as ___
a.vibrations b.loud c.reactions d. all of these
please help me answer this questions it’s due tomorrow 7am….
3. D
Explanation:
nice
Answer:
1(the answer is the brain stem)
2(the answer is the neurons)
3(the answer is the vibrations)