The transmitter and the receiver both have to work very, very well for it to be useful to the bat. If a bat had one or the other parts of the mechanism that are only "part way done", it does the bat no good, and would provides no competitive advantage for survival, as I understand the theory of evolution.
For purposes of discussion, suppose it took 10,000 gradual mutations for the whole thing to work at all. After 1,000 mutations, it is still useless.
Yet, my understanding is that the earliest bat fossils are fully formed ... there aren't 'links'.
2007-03-01
01:20:40
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6 answers
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asked by
lda
4
in
Biology