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TLS Online TPP Program

#Question id: 4943

In what way were conditions on the early Earth of more than 3 billion years ago different from those on todayʹs Earth?

#11. Evolution and Behavior

  1. only early Earth had water vapor in its atmosphere.

  2. Only early Earth was intensely bombarded by large space debris.

  3. Only early Earth had an oxidizing atmosphere.

  4. Less ultraviolet radiation penetrated Earthʹs early atmosphere.

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TLS Online TPP Program

#Question id: 4947

#11. Evolution and Behavior

The first genes on Earth were probably
TLS Online TPP Program

#Question id: 4948

#11. Evolution and Behavior

RNA molecules can both carry genetic information and be catalytic. This supports the proposal that 
TLS Online TPP Program

#Question id: 4949

#11. Evolution and Behavior

What probably accounts for the switch to DNA-based genetic systems during the evolution of life on Earth?
TLS Online TPP Program

#Question id: 4956

#11. Evolution and Behavior

Which measurement would help determine absolute dates by radiometric means?
TLS Online TPP Program

#Question id: 4957

#11. Evolution and Behavior

How many half-lives should have elapsed if 6.25% of the parent isotope remains in a fossil at the time of analysis?
TLS Online TPP Program

#Question id: 4958

#11. Evolution and Behavior

What is true of the fossil record of mammalian origins?