Flatworms
James H. Thorp, D. Christopher Rogers, in Field Guide to Freshwater Invertebrates of North America, 2011
B Reproduction and Life History
Some flatworms, especially those living in temporary aquatic habitats, reproduce only once per year (univoltine), while other species are multivoltine, with the number of generations depending on environmental favorability. Most flatworms reproduce sexually, and almost all species are hermaphroditic. Although gamete exchange is most common, self-fertilization is possible in some species. Eggs are laid singly on a hard substrate, are grouped into clusters (sometimes stalked), or are placed in cocoons. Miniature flatworms emerge from eggs which have been attached to the substrate. These usually develop directly (without intermediate larval stages) into adults and differ only in size and presence of reproductive organs. A few species are ovoviviparous (young brooded inside parent) or have a distinct larval stage. Asexual reproduction occurs seasonally in many taxa and is the only form of reproduction in a few species. This form of reproduction involves differentiation of the adult body into distinct units (zooids) followed by separation into small flatworms via transverse division of the adult body. This process is aided by the remarkable regenerative abilities of flatworms.
Under demanding environmental conditions, flatworms produce resistant eggs able to survive desiccation of the surrounding environment or the animal may enter diapause (a very low metabolic state) and encyst as a whole animal or fragment of the adult.
Sexually reproducing flatworms can live from a few weeks to a few months (not counting periods of encystment), while the life span of asexual species is theoretically indefinite.
An organic molecule will always contain
carbon
carbon and hydrogen
OO, H. and C
hydrogen
Answer:
carbon atoms
Explanation:
all organic molecules have carbon.
Observations, evidence and data that people gather and test support and evaluate scientific explanations is called _____ *
Answer:
the answer is theory
Explanation:
hope you have what you are looking for! Thx!
How does the acidity of acid rain compare to the acidity of natural rainwater
Answer:
The acidity level of water is measured by the pH scale. Pure water has a pH of 7, which is neutral. However, natural rainwater actually has a pH of 5.6 because it gets exposed to the gases in the atmosphere, making it a bit acidic. True acid rain will have a pH level measuring from 5.0-5.5.
PLS HELP ME ANSWER THIS AS FAST AS POSSIBLE!!!!!
Answer:
1st
Explanation:
1st answer im pretty sure, cuz cells are pretty simple, and in the end its the organism which makes up all of it
how can liquid be drawn into a pipette safely
Answer:
A. by squeezing and releasing a bulb attached to the wide end of the pipette
Explanation:
A. by squeezing and releasing a bulb attached to the wide end of the pipette
Can someone help me with these questions?
Answer:
1.32°F
2.212°F
Explanation:
1.The melting point is the temperature at which a solid turns to a liquid. The melting point at which ice — a solid — turns to water — a liquid — is 32°F (0°C).
2.Water boils at 212°F at sea level, but only at sea level. Changes in atmospheric pressure will alter the temperature at which water boils. To use this calculator you will need your current pressure and elevation.
3.In other words, the water molecules within ice move faster. However, temperature doesn't change as heat is added during a phase change; for example, when the ice melts. During the phase change, the added heat doesn't make the molecules move faster, but rather further apart.
The formula CaCI2 represents the compund___
What best describes the scientific process?
Answer:
B.
Explanation:
The scientific method follows a series of six steps in which it includes the one from observation to reaching a conclusion.
The statement that best describes the scientific process is that it is a way to answer scientific questions.
What is the scientific process?The scientific process is a method of discovering knowledge about the natural world in the following manner:
making falsifiable predictions (hypotheses). testing them empiricallydeveloping theories that match known data from repeatable physical experimentation.The scientific process involves the following steps:
Asking a questionDoing background researchConstructing a hypothesis. ...Testing of the hypothesis by doing an experimentAnalyzing the data and drawing a conclusionThe aim of the scientific process is to answer a scientific question or proffer solution to a problem.
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When does the first quarter phase of the moon occur?
Select one:
a. three weeks after the new moon phase
b. one week after the full moon phase
c. two weeks after the third quarter phase
d. two weeks after the new moon phase
Answer:
l think
b. one week after the full moon phase
what causes a population to reach is carrying capacity
Answer:
Good well fare taxes and pricing
Explanation: not only that but benefits with health and cost for homes and the environment
Which process(es) converts stored energy into usable energy?
0
A. aerobic cellular respiration
0
B. fermentation
C. both aerobic cellular respiration and fermentation
OD. neither aerobic nor fermentation
Answer:
it is C
Explanation:
just trust me bro
All proteins have amino acids as their building blocks. Even though there are only 20 amino acids, there are more than a million different proteins, and each works in a unique way. Which of the following conclusions about a protein's function is best supported by this information? (4 points)
Group of answer choices
The amino acids combine in different ways to form proteins with different shapes, and this affects which molecules can bind to it, which in turn directs the protein's function.
The amino acids reproduce in different ways, and this allows them to form many different proteins, which in turn directs the protein's function.
The shape of a protein determines what amino acids it is made of and what types of reactions it can be used for, which in turn affects the protein's function.
The shape of a protein dictates when a protein will break apart into amino acids, which in turn affects the protein's function.
Answer:
The amino acids combine in different ways to form proteins with different shapes, and this affects which molecules can bind to it, which in turn directs the protein's function.
Explanation:
There are many different combinations for amino acids to bind, and all of the different combinations have very different structures.
Additionally, the unique shapes of all proteins determine the exact function that they have.
These different shapes will also affect what molecules can bind to it.
Why is water necessary for living things?
Answer:
To survive
Explanation:
Without water, we wouldn't have organisms such as fish. We also need it to break down food molecules or generate energy during the respiration process.
What would happen to a plant cell if it placed in water?
Answer: It really depends on if the water solution is hypotonic, hypertonic, or isotonic. If it is hypotonic (water with less salt or other dissolvent in it than the cell), you can expect the cell to take in water and expand. If the water is isotonic (about the same amount of dissolvent in it as the cell) just about nothing will happen, or if the water is hypertonic (more dissolvent in the water than the cell) the water can seep out of the cell, and into the water.
Why do people believe in false claims?
Answer:
Becuase everyone has different beliefs and some also can be more concieveing than other aslo meaning the ones that are very easily influenced will believe you toward the not so influenced people will also do research and stuff like that. Therefore, some fasle claims are believed.
Explanation:
Leigh investigates the color of shells deposited on a beach as she walks along the coastline. She wants to know whether this variation in color is due to chance or if it is significant. Data was collected over a minimum 20 cm long region at four sites along the beach coast. Shells were categorized into four different shades, 1 being the lightest and 4 being the darkest. What is the mean number of shells collected?
Answer:
the data is QUANTITAVE because it includes data that are NUMBERS a CHI-SQUARE will be used ...
Explanation:
right on edge for ap bio
Answer:
slide 4 is 4.79
Explanation:
correct on ap bio edge 2021
5. Explain why a washing machine would be considered technology.
Answer:
It's technology because it does a certain service for you with less time wasted if you did it by hand.
Explanation:
Which is a nonrenewable resource
Answer:
coal,fossil fuels,nuclear energy i think
Answer:
Coal
Explanation:
Coal is a mineral found in caves so it cannot be made. That is why it is nonrenewable.
[tex]\red{\bf{Q}}[/tex] Which one of the following preceeds re-formation of the nuclear envelope during M phase of the cell cycle :-
(1) Transcription from chromosomes and reassembly of the nuclear lamina.
(2) Formation of the contractile ring and formation of the phragmoplast.
(3) Formation of the contractile ring and transcription from chromosomes.
(4) Decondensation from chromosomes and reassembly of the nuclear lamina.
☕ Do explain the answer with proper explanation and spam answers are not allowed !!
[tex]\orange\bigstar\:\rm{\pink{\overbrace{\underbrace{\purple{Correct\:option\:\longrightarrow\:[4]\:}}}}}[/tex]
[tex]\rm{\gray{\underline{\underline{\blue{REASON:-}}}}}[/tex]
M phase is known as mitotic phase and cell division occurs in this phase . The re-formation of the nuclear envelope during M-phase of the cell cycle takes place during telophase . The nuclear membrane which disappears during propahse reappears in the telophase . But before it is reformed the nucleus gets reorganised by Decondensation from chromosomes and reassembly of the nuclear lamina .MORE INFO :-______________
⚡ At telophase stage, nuclear membrane vesicles associate with the surface of individual chromosomes and fuse to reform the nuclear membranes, which partially enclose clusters of chromosomes before coalescing to reform the complete nuclear envelope .
Which feature of nuclear fission reactions allows these reactions to take place in a chain reaction?
Thermal energy is released and heats up the reactants.
More smaller atoms form that can undergo fission.
A larger atom is formed, which can then be split.
Neutrons start the reaction and are released during it.
Answer:
Neutrons start the reaction and are released during it
Explanation:
N
Neutrons start the reaction and are released during it is the correct answer.
What is responsible for chain reaction?Neutrons start the reaction and are released during it is the feature of nuclear fission reactions that allows these reactions to take place in a chain reaction because the neutron that is released hit the other atom which leads to the start of other reaction and so on.
so we can conclude that Neutrons start the reaction and are released during it is the correct answer.
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Which of the following statements correctly supports the conclusion that eukaryotic cells are more complex than prokaryotic cells?
A. only eukaryotic cells contain ribosomes
B. Only eukaryotic cells can be seen using a microscope
C. Only eukaryotic cells contain membrane bound organelles
D. Only eukaryotic cells contain DNA and RNA
Can you help me with the question listed in the pictures below? Please and thank you. Will mark BRAINLIEST!!! Answer choices Decrease or Increase
Answer: Decrease
Explanation: Because their foot is being used more.
I think that's what it said.
Why is the polarity of water molecules and hydrogen bonding essential to adhesion and cohesion?
Some properties like Polarity makes water a good solvent, cohesion helps in stick water molecule to itself while adhesion helps it to stick with other surfaces. Water have surface tension due to hydrogen bonding.
What are the difference between adhesion and cohesion ?when two similar molecule come closer adhesion occur where as in cohesion two similar molecules face the force of attraction.
Adhesion is the force of attraction observed between the water molecules and xylem vessels while Cohesion is unrestrained among water molecules.
Capillary action and meniscus are the effects of adhesion while Surface tension, meniscus and capillary action are the effects of cohesion.
The major forces responsible for adhesion are electrostatic or mechanical forces while Cohesion is the result of hydrogen bonding and Van der Waals forces.
A strong adhesion can lead to spread of liquid all over the surface while cohesion forms water droplets.
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What are the parts of an atom and the charges associated with each part?
atoms in covalent bonds___their electrons
Answer:
gain there electrons that they didn't have before
E.Coli is a type of prokaryotic bacterium that is present in contaminated food. Which describes where the genetic material is found
A.cytoplasm
B.Cell membrane
C.Ribosome
D.Nucleus
Answer:
Cytoplasm
Explanation:
In prokaryotes DNA is located directly within the cellular cytoplasm
In the E.coli, that is, a prokaryotic bacterium, the genetic material is found in the cytoplasm.
The genetic material in E.coli:E.coli is a prokaryotic bacterium, and in all the prokaryotic cells, genetic information is carried on a single circular strand of DNA, which is either present in direct contact with the cytoplasm or is attached to the cell membrane.
In the prokaryotes, no enclosing membrane organelle is present, therefore, no nucleus is found. They comprises a concentration of DNA called nucleoid, which is not encircled by a nuclear membrane. Apart from this, no unique proteins are found attached with the molecule of DNA.
Thus, the correct answer is option A, that is, cytoplasm.
Find out more information about genetic material in E.coli here:
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If you have an experiment in which there are 4 different groups, and the same variable is manipulated in all of them, is there a control group?
Answer:No
Explanation:I believe it is no due to the fact that the variable is being manipulated in all groups and in order to be a control groups the variable must remain the same or must not be manipulated.
hope this helps :)
About how much energy’s lost when an organism consumes another organism from a different trophic level?
Answer:
10 percent of energy is transferred to the next level of organisms so that would lead me to believe that 90 percent of the energy is lost.
The alignment causes a solar eclipse.
Answer:
Whats the question?
Explanation:
Answer:
the moon moves just far enough to cast a shadow to cause an eclipse.
Which of the following leads to genetic variation in gene pools?
A. gene flow C. mass extinctions
B. isolation D. punctuated equilibrium
Answer:
b
Explanation: