The degree of variation of organisms within an ecosystem, biome, or entire planet is called

What adaptations were necessary for marine organisms to evolve into land-dwelling organisms?

Why was the development of proto-amphibians so significant to life on early Earth?

A scientist finds a fossil of an organism with porous skin that would enable the organism to live partly in water and partly on land. This organism is likely a(n)

Suppose you find a fossil of a reptile-like organism from 150 million years ago, but its tail appears to be much shorter than that of other reptile fossils from this time period. Some body parts have feather-like extensions. What could this be?

What is episodic speciation?

Which is a reasonable statement about the asteroid impact 65 million years ago?

Which of these is written in the correct order of appearance on Earth (from earliest to most recent)?

The Cambrian explosion is a good example of

When did modern humans first appear?

How were organisms in the genus Homo different from other mammals?

Which of these organisms most recently had a common ancestor with modern humans?

Which is a possible explanation for the large numbers of dire wolves found in the La Brea Tar Pits?

Where are the La Brea Tar Pits located?

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