Multiple Choice
What evidence most strongly suggests that an impact by an asteroid or meteorite may have caused the extinction of the dinosaurs?
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24. History of Life on Earth
History of Life on Earth
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Which of the following best describes how the breakup of Pangaea affected evolution?
A
Mammals had an opportunity to become dominant.
B
Shallow marine habitats became scarcer.
C
Extensive glaciation caused mass extinctions.
D
Sympatric speciation became the primary means by which new species were formed.
E
The geographic isolation of populations that had previously coexisted led to speciation.
Verified step by step guidance1
Understand the concept of Pangaea: Pangaea was a supercontinent that existed during the late Paleozoic and early Mesozoic eras. Its breakup led to the formation of the continents as we know them today.
Recognize the impact of geographic isolation: When Pangaea split, populations of organisms that were once together became separated by oceans and other geographic barriers.
Explain speciation: Speciation is the process by which new species arise. Geographic isolation is a key factor in allopatric speciation, where physical separation leads to the divergence of species.
Connect geographic isolation to evolution: As populations became isolated, they adapted to their new environments, leading to genetic divergence and eventually the formation of new species.
Conclude with the role of Pangaea's breakup: The breakup of Pangaea created new environments and isolated populations, which facilitated speciation and contributed to the diversity of life we see today.
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