Multiple Choice
Which group of animals underwent adaptive radiation and rapidly expanded in diversity after the extinction of the dinosaurs?
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24. History of Life on Earth
Adaptive Radiation
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Why do island chains provide ideal conditions for adaptive radiation to occur?
A
They have abundant resources, eliminating the need for adaptation.
B
They offer diverse habitats and limited competition, allowing species to evolve rapidly.
C
They are isolated, preventing any form of speciation.
D
They have a stable climate that prevents evolutionary changes.
Verified step by step guidance1
Understand the concept of adaptive radiation: It is the process by which organisms diversify rapidly into a multitude of new forms, particularly when a change in the environment makes new resources available, creates new challenges, or opens new environmental niches.
Recognize the role of island chains: Islands often have diverse habitats due to variations in climate, altitude, and available resources, which can lead to different selective pressures on species.
Consider the aspect of limited competition: On islands, there are often fewer species compared to mainland areas, which means less competition for resources. This allows species to exploit different niches.
Acknowledge the importance of isolation: Islands are geographically isolated, which reduces gene flow from outside populations. This isolation can lead to speciation as populations adapt to their unique environments.
Evaluate the incorrect options: Abundant resources without the need for adaptation, prevention of speciation, and a stable climate preventing changes do not align with the conditions that promote adaptive radiation.
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