The number of half-lives that has elapsed when 3 atoms of the radioactive substance remains is 6 (Option C)
Data obtained from the questionHalf-life (t½) = 500 million yearsOriginal amount (N₀) = 192 atomsAmount remaining (N) = 3 atoms Number of half-lives (n) =?How to determine the number of half-lives2ⁿ = N₀ / N
2ⁿ = 192 / 3
2ⁿ = 64
2ⁿ = 2⁶
n = 6
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Active transport, unlike its passive counterpart, is beneficial because it can move large, polar molecules against the concentration gradient (L to H).
A. True
B. False
A frame which is used for ecological sampling
Answer:
A quadrat is a frame (usually a square or a circle) of known area used to isolate a subset of the population. This subset will comprise one sample. Quadrats come in various sizes (and shapes) with the size selected determined by features of the organisms in the population to be sampled.
Explanation:
hope this helps
Fur seals and sea lions have similar anatomy. They probably have a common ancestor.
make a list of social norms being practiced in your family and community
Answer:
conservation of public properties
respecting senior
love junior
helping person of societies in need.
participating in the religious functions of neighbors.
Write two functions of kidney.
Answer:
remove waste products from the body. remove drugs from the body. balance the body's fluids. release hormones that regulate blood pressure.
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Which of the following lists contains organisms with different kinds of cells?
A earthworm, clam, insect, jellyfish
B. redwood tree, daisy, rose, bacteria
C. turtle, chicken, dolphin, salamander
D. tulip, daffodil, sunflower, oak tree
The features of alveoli for the efficient exchange of gases.
A. Thin wall, moist layer and less blood vessels
B Thin wall, moist layer and more blood vessels
C. Thick wall, moist layer and more blood vessels
Explanation:
The alveoli are lined with mucus and are surrounded by a network of blood capillaries. They have very thin walls for gases to be absorbed through. An individual air sac is called an alveolus. The layer of moisture in the alveoli allows gases to dissolve so that they can diffuse quickly.
1. Shifting from mechanical picking to hand picking results in which of the following improvements?
a. reduced labor cost
b. increased packing efficiency
c. reduced senescence
d. increased speed
Answer:
The answer is A
Explanation:
can trees and plants cause soil erosion?
Answer:
no
Explanation:
it will not cause soil erosion because tree or plant root will handle it very strongly
¿Cómo puede el río cambiar el lugar de la topografía?
Answer:
Los mapas topográficos utilizan el sistema de representación de planos acotados, mostrando la elevación del terreno utilizando líneas que conectan los puntos con la misma cota respecto de un plano de referencia, denominadas curvas de nivel, en cuyo caso se dice que el mapa es hipsográfico.
Explanation:Además de los campos mencionados anteriormente, la topografía es fácilmente aplicable a cualquier trabajo o proyecto donde se necesite realizar planos, obtener datos de un terreno y ubicar puntos en la superficie terrestre con gran precisión y rigurosidad técnica.Es posible determinar la posición de un punto sobre un plano horizontal: a partir de un solo punto conocido, por levantamiento de poligonales , un método que consiste en medir distancias horizontales y azimut a lo largo de una línea quebrada (ver Sección 71);
can people see solar winds?
Answer:
Yes
Explanation:
astrophysicists can now see the solar wind with their own eyes.
Which kind of investigations are meant to provide large amounts of information about a wide range of variables?
Answer:
Comparative investigations
Explanation:
Answer:
Comparitive investigations
Put the following events in the correct order:
A. mRNA leaves the nucleus and goes into the cytoplasm
B. The DNA sequence is copied to the mRNA sequence during transcription
C. Proteins determine our traits
D. Ribosomes read the mRNA and create a chain of amino acids
Answer:
the correct order is B,A,D,C
hey
special announcement
Answer:
WHATS WITH PEOPLE POSTING MEET LINKS THAT NOBODY WANTS TO JOIN
A researcher stimulates, with a small electrical charge, a portion of a cat's limbic system. The cat suddenly jumps and acts as if it is fighting. What portion of the limbic system was stimulated
Answer: amygdala
Explanation:
The limbic system, refers to the set of brain structures that's located on the sides of the thalamus. The function of the limbic system include olfaction, behavior, emotion, and long-term memory.
Since the cat suddenly jumps and acts as if it is fighting, the portion of the limbic system that was stimulated is the amygdala.
Which weather event usually includes heavy precipitation, strong circulating winds, develops over water, and has warmer surface air temperatures?
Answer:hurricane tropical cyclone
Explanation:
A hurricane is a large rotating storm with high speed winds that forms over warm waters in tropical areas. Hurricanes have sustained winds of at least 74 miles per hour and an area of low air pressure in the center called the eye
Using an example, (either molecular or macroscopic, or both if you can) describe how a mutation could have no effect on the organism. have a negative effect on the organism have a beneficial/positive effect on the organism.
Answer:
i rly dont know i just need points
Explanation:
pilot
2. What is the difference between a wave and a
particle?
a. A particle is a discrete unit of energy, a wave is a
continuous flow of energy
b. A wave carries energy: a particle carries light
C. A wave moves at the speed of light; a particle can
move at a range of speeds
d. A wave carries electricity, a particle carries a
magnetic charge
Answer:
d A wave Carrie's electricity ,a particle carries a magnetic chaege
Answer:
A. A particle is a discrete unit of energy, a wave is a
continuous flow of energy
Explanation:
Which two statements below correctly describe one similarity and one difference between cellular respiration and photosynthesis?
Cellular respiration and photosynthesis both involve water.
Cellular respiration uses sugar and photosynthesis produces sugar.
Cellular respiration and photosynthesis both use light to produce energy.
Cellular respiration requires light energy and photosynthesis requires chemical energy.
A. Statements 1 and 2
B. Statements 1 and 4
C. Statements 2 and 3
D. Statements 3 and 4
Answer:
The answer is A.
In the equation of breakdown of glucose (cellular respiration) and photosynthesis the end product of both is water, oxygen and carbon (iv) dioxide. And both involve glucose in the chemical reaction.
Which of the following is driven by energy from the sun?
A) Water Collection
B) Groundwater flow
C) Evaporation
D) Precipitation
Answer:
evaporation
Explanation:
the sun help evaporate the water into the clouds ^^
Answer:
C I think
Explanation:
Sorry if wrong
A light meal will digest in about how many hours?
1-2 hours
3-5 hours
6-8 hours
10-12 hours
Which Enzyme has an optimal pH that is Acidic?
A. Pepsin
B. Salivary amylase
C. Arginase
Answer:
a. pepsin
Explanation:
it has a 1 to 2 level which is acidic because anything lower than 7 is acidic
Answer:
A. Pepsin
Explanation:
The enzyme pepsin breaks down proteins in the acidic conditions of the stomach. Pepsin has an optimum of pH 2.5 and a working range of between pH 1-4.
What would 2 different species in an ecosystem ultimately compete for
Answer:
maybe you could put natural resources
Explanation:
like water, food, shelter, etc.
you could also put territory
i would say mating but you said two different animals lol
The nervous system primarily communicates using
electrical impulses
hormones
blood cells
none of the above
Answer:
electrical impulses
Explanation:
Why could reproductive cells from an apple tree and a banana tree never combine to form an offspring? Use data and scientific reasoning to construct an explanation.
Answer:
Difference in chromosome number.
Explanation:
The reproductive cells from an apple tree and a banana tree never combine to form an offspring because of the difference of species. There is different number of chromosomes in the both apple and banana tree. There are 17 number of chromosomes in apple whereas 33 number of chromosomes in banana tree so due to this difference in the chromosome number apple and banana tree can produce offspring due to combination.
The process of formation of new offspring from the parents is called reproduction. Reproduction help to ensure the continuity of species generation after generation. There are two types of reproduction, these are as follows:-
SexualAsexual.Reproduction required the gametes of the same species for fusion. The mating of the two gametes is known as fertilization.
According to the question, the apple tree and a banana tree never combine to form offspring because of the gamete difference, These gametes are from different species.
Hence, they cannot reproduce.
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Digestion of dietary fats _____. a. occurs primarily in the large intestine b. occurs primarily in the stomach c. involves the small intestine but not the pancreas d. results in triglycerides, phospholipids, and sterols as end products e. requires bile and lipase
The answer of the question is option (b).
Digestion of dietary fats ocuurs majorly when it reaches to the small intestine.
In the United
States, what is
the AVERAGE
beef cow herd
size?
A. 10 head
B. 25 head
C. 40 head
D. 70 head
Answer:In the United States the average cow herd size is C.40 herds
Explanation: 40 herds is the average
Entre as características evolutivas que diferenciam as gimnospermas das pteridófitas, estão a:
a) Presença de sementes.
b) Presença de vasos condutores.
c) Presença de flores e frutos.
d) Presença de caule.
e) Presença de caule, folhas e raízes.
Answer:
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Explanation:
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As part of the greenhouse effect, Earth’s surface radiates heat back into the atmosphere and the atmosphere absorbs this heat. Why do areas near the equator generally radiate more energy back into the atmosphere than areas near the poles?
Areas near the equator have more clouds in the atmosphere than areas near the poles.
Areas near the equator receive more incoming solar energy than areas near the poles.
The greenhouse effect only occurs near the equator.
The greenhouse effect only occurs near the poles.
Answer:
The correct answer is B. Areas near the equator receive more incoming solar energy than areas near the poles.
Explanation:
The equator is located in the center of the planet from North to South, this location cause this zone and nearby zones to receiver more solar energy than areas near the poles. This occurs because the natural tilt of Earth makes sun rays directly hit the equator all the time of the year, while areas in the poles are not hit directly and the exposition to sunlight varies with the seasons of the years. This explains why in the equator the temperatures are higher than in the poles. Besides this, the difference in radiation received makes areas in the equator radiate more energy back due to global warming gases, and the global warming phenomenon.
Areas near the equator receive more incoming solar energy than areas near the poles.
What is greenhouse effect?Greenhouse effect, a warming of Earth’s surface and troposphere (the lowest layer of the atmosphere) caused by the presence of water vapour, carbon dioxide, methane, and certain other gases in the air.
The equator is located in the center of the planet from North to South, this location cause this zone and nearby zones to receiver more solar energy than areas near the poles.
This occurs because the natural tilt of Earth makes sun rays directly hit the equator all the time of the year, while areas in the poles are not hit directly and the exposition to sunlight varies with the seasons of the years.
This explains why in the equator the temperatures are higher than in the poles. Besides this, the difference in radiation received makes areas in the equator radiate more energy back due to global warming gases, and the global warming phenomenon.
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PLEASE HELP ME!!
Mental illness is:
A. seen usually only in large metropolitan areas
B. common
C. very rare
D. found only 1 out of 100 adults
AP_EX - *PSYCHOLOGY*
Answer:
B
Explanation: Unfortunately it's common for people .