What Is the Predominant Hypothesis to Explain Why Animals Only

question 101

Multiple Choice

What is the predominant hypothesis to explain why animals only appeared in the fossil record about 3 billion years after life originated?

• A)There were animals 3 billion years ago, they just weren't fossilized.
• B)Animals are warm-blooded, and the ocean was too cold for animals to evolve 3 billion years ago.
• C)Animals large enough to be recorded in the fossil record could not evolve until oxygen reached levels sufficient to support aerobic respiration.
• D)Animals are heterotrophic and couldn't evolve until there were enough photosynthetic organisms on Earth to support being eaten by animals.

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