Geologic Time: Early Life & Extinction Events — Quiz

Question 1

Which graph best illustrates how biodiversity has been affected by mass extinctions in Earth’s past?

Revolt · Accepted Answer

Image with description A simple line graph with the x-axis labeled "Time" and the y-axis labeled "Diversity." The graph shows a repeating pattern of upward-sloping lines followed by sharp drops, forming a jagged, rising, step-like pattern as it moves from left to right.

Question 2

What evolutionary event enabled the formation of eukaryotic cells?

Revolt · Accepted Answer

endosymbiosis

Question 3

What evolutionary event enabled the formation of eukaryotic cells?

Revolt · Accepted Answer

endosymbiosis

Question 4

Which evolutionary innovation helped vertebrates survive and diversify following major environmental changes during the Paleozoic Era?

Revolt · Accepted Answer

amniotic eggs

Question 5

The End-Permian mass extinction is generally considered the most extreme mass extinction event in Earth’s history. According to this graph, the rate of extinction at the end of the Ordovician Period was higher. How can both of these conclusions be accurate?

Revolt · Accepted Answer

The mass extinction event at the end of the Ordovician Period happened over a shorter period of time, so the rate of extinction was higher.

Question 6

What evolutionary event enabled the formation of eukaryotic cells?

Revolt · Accepted Answer

endosymbiosis

Question 7

Which event marked the rapid diversification of marine life into forms that included hard shells and complex eyes?

Revolt · Accepted Answer

Cambrian Explosion

Question 8

Match each event with its effect on biodiversity.

Revolt · Accepted Answer

rapid diversification of multicellular marine life|95 percent decrease in marine biodiversity|loss of all non-avian dinosaurs

Question 9

Match each event with its effect on biodiversity.

Revolt · Accepted Answer

rapid diversification of multicellular marine life|95 percent decrease in marine biodiversity|loss of all non-avian dinosaurs

Question 10

Scientists generally agree that the Cretaceous-Paleogene mass extinction was caused by an asteroid impact. Which factor most likely explains the success and diversification of mammals and birds after that event?

Revolt · Accepted Answer

Adaptations like warm-bloodedness, hair and feathers, and rapid reproduction helped them survive and evolve.

Geologic Time: Early Life & Extinction Events — Quiz Answers

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