A. There were animals 3 billion years ago; they just weren't fossilized. B. Animals are warm-blooded; the ocean was too cold for animals.
The red dot is filled. The other red dot is filled because
Answer:
<u><em>How can you tell from a food web which organisms will have the greatest biomass?</em></u>
The tropic level contains the greatest biomass in most ecosystems is producers. This occurs because producers get their energy from the sun, the sun is the most available resource, so there are the most at that level.
Explanation:
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