It is difficult to imagine how only part of an adaptation could function, but darwin explained this. how would he answer the question, “what good is 5% of an eye? ”
a) once an organism has the first 5% of an adaptation, the rest will quickly evolve.
b) five percent of an eye is always better than a full eye since it is easier to grow. the difficulty is in explaining fully formed eyes.
c) since variation is random, we don’t expect to see more than about 5% of an eye in any species.
d) five percent of an eye, perhaps a simple light-sensitive spot, is often better than having no eye at all.
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It is difficult to imagine how only part of an adaptation could function, but darwin explained this....
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