One of your professors says that fleas jump so high because they have specially adapted leg structures and muscles. But your other professor says that fleas jump high because evolution selected for individuals with genes that helped them avoid being damaged by the scratching behavior of their host. So -- why do fleas jump high?
A. Because evolution selected for individuals with genes that helped them avoid being damaged by the scratching behavior of their host.
B. The proximate cause is that they have specially adapted leg structures and muscles, and the ultimate cause is that evolution selected for individuals with genes that helped them avoid being damaged by the scratching behavior of their host.
C. The ultimate cause is that they have specially adapted leg structures and muscles, and the proximate cause is that evolution selected for individuals with genes that helped them avoid being damaged by the scratching behavior of their host.
D. Because they have specially adapted leg structures and muscles.
Answer: B
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