During cellular respiration, organisms produce _____.

The less energy available to a population, the _____ population will be.

All plants and animals depend on energy from the _____.

_____ eat only plants.

Organisms that make their own food are called _____.

A population of a species is able to evolve because _____.

The geologic time scale is useful to _____.

Which theory explains that organisms change because of adaptations that help them survive?

The group made of humans and their humanlike ancestors is called _____.

Which of the following would NOT help explain how evolution occurs?

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