The pair of traits that best illustrates convergent evolution is
A. an elephant's tusks and a beaver's teeth.
B. a lizard's arm and a bird's wing.
C. a dragonfly's wing and a butterfly's wing.
D. a cartilage skeleton in a shark and a bone skeleton in a dolphin.
Clarify Question
What is the key concept addressed by the question?
What type of thinking is required?
Gather Content
What do you already know about convergent evolution? What other information is related to the question?
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
D. a cartilage skeleton in a shark and a bone skeleton in a dolphin.
Clarify Question
What is the key concept addressed by the question?
· The question stem is asking you to select which pair of traits is an example of convergent evolution.
What type of thinking is required?
· You are being asked to take what you already know and use, or apply, it to convergent evolution.
Gather Content
What do you already know about convergent evolution? What other information is related to the question?
· Convergent evolution explains how natural selection appears to favor parallel evolutionary adaptations in similar environments. Because selection in these instances has tended to favor changes that made the two groups more alike, their phenotypes have converged.
Choose Answer
Given what you now know, what information is most likely to produce the correct answer?
· Convergent evolution occurs when traits are similar due to the natural selection of traits best adapted to similar environments. The traits are not similar due to a common ancestor between the two organisms. The skeletons of a shark (made from cartilage) and a dolphin (made from bone) are not a result of having a common ancestor.
Reflect on Process
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
· Answering this question correctly depended on your ability to use convergent evolution in a new situation¼ If you got an incorrect answer, did you remember that convergent evolution explains why two unrelated species may share similar phenotypic traits, or that the environment affects adaptations by the natural selection of the most adaptive phenotype? Did you have trouble extending convergent evolution to determine the correct answer?
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