Cooperation helps because they both defend each other. its a friendship that allows for living longer. For example, Near sharks, fish stay behind them, so that they are not killed, thats one example.
Explanation: The biological fitness of an organism is dependent on its ability to survive and reproduce in a given environment. A trait that increases ability to survive, but makes an individual sterile, decreases fitness because the organism cannot produce offspring to carry on the trait.
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plants cannot sustain themselves because they need dirt for fertilizer the sunlight to grow in water for hydration. they also need homeostasis for a heathy balance
Your answer will be A producer because producers are plants they give off food and a lot of animals eat their their at the bottom of the pyramid because that have nothing in defense also an ts not D because those are like lions, and bears stuff that eat things (like predators) also its not B because omnivores eat both plants and animals like bears and when it came down to rather A, or C I choose A because herbivores are animals that eat plants like a sloth.
Your answer is A.