* cannot make their own food, while ** can.

Lice forming from sweat is an example of

What kind of atmosphere did Earth originally have?

DNA is simpler than RNA.

Individual organisms are able to evolve.

An acquired characteristic is passed on to offspring.

Evolution

All of the following would be possible mechanisms of natural selection except

A breeds with D and produces fertile C. If A breeds with B, sterile E is produced. Which belong to the same species?

Which of the following is a likely outcome of the effects of a geographic barrier?

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