Geological Times: Eons, Eras, and Periods
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Questions and Answers

During which geological era did the Cambrian Explosion occur?

  • Neoproterozoic
  • Cenozoic
  • Mesozoic
  • Paleozoic (correct)

What possible environmental conditions contributed to the Cambrian Explosion?

  • Shallow warm waters (correct)
  • Cold sea temperatures
  • Deep oceans
  • Low oxygen levels in the atmosphere

Which type of organisms resulted from the Cambrian Explosion?

  • Flying insects
  • Land mammals
  • Desert plants
  • Aquatic life forms (correct)

What was the adaptive advantage of hard-bodied animals during the Cambrian Explosion?

<p>Better defense against predators (D)</p> Signup and view all the answers

Which group of animals are considered the ancestors of insects, spiders, and crustaceans?

<p>Arthropods (A)</p> Signup and view all the answers

What is the most recent eon in the geological time scale?

<p>Phanerozoic (B)</p> Signup and view all the answers

How many periods is the Paleozoic era divided into?

<p>6 (C)</p> Signup and view all the answers

What was a result of the increase in oxygen levels in the atmosphere during the Cambrian Explosion?

<p>The emergence of complex life forms (D)</p> Signup and view all the answers

What was a characteristic of brachiopods that evolved during the Cambrian Explosion?

<p>Hard-bodied with shells (A)</p> Signup and view all the answers

What was a benefit of having a hard-bodied shell during the Cambrian Explosion?

<p>Provided good defence against predators (D)</p> Signup and view all the answers

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