Earth's earliest atmosphere lacked which gas that is necessary for life as we know it to exist today?

A ________ structure has the same parts/features in related species, but has a different function.

The fossil record provides ____ about the history of life and past environments on Earth.

Rabbits that have brown coats all spring and summer, shed their coats and grow a white one for the winter. This is an example of a(n)

What type of evolution occurs when a species branches off into two separate species due to an isolating event?

The change in living things over time is called

Evidence for the theory of evolution include

When two species evolve together due to an ecological relationship, it is called

Characteristics which improve an organisms chance of survival and reproduction is called

The human appendix is an example of a

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