Question

question 7 of 10
the ______ era had many extinctions because of large variations in climate.

a. cenozoic

b. mesozoic

c. precambrian

d. paleozoic

Explanation:

To solve this, we analyze each era:

• Cenozoic: Known for mammalian diversification, not major extinctions due to climate variation as the main cause.
• Mesozoic: Ended with a mass extinction (asteroid, not climate variation as the main driver here).
• Precambrian: Had early life, but major extinctions due to climate variation are not its defining feature.
• Paleozoic: Experienced multiple extinctions, including the Permian - Triassic, often linked to large climate variations (e.g., glaciations, ocean anoxia).

Answer:

D. Paleozoic