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High School Biology: From the First Organism Onward - Earth Forms and Life Begins (Fill in the blank)
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High School Biology: From the First Organism Onward - Earth Forms and Life Begins (Fill in the blank)
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8 Questions

1. The first eukaryotic cells probably evolved about ____________ billion years ago.

2. ____________ dating determines about how long ago a fossil organism lived.

3. The early atmosphere contained ammonia, methane, water vapor, and carbon dioxide, but only a small amount of ____________.

4. ____________ occurs when a species completely dies out.

5. Miller and Urey demonstrated that ____________ molecules could form under simulated conditions on early Earth.

6. It is thought that one early cell gave rise to all subsequent life on Earth. That one cell is called the ____________.

7. A molecular clock uses DNA____________ sequences to estimate how long it has been since related species diverged from a common ancestor.

8. ____________ are the preserved remains of organisms that lived in the past.

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