All the vertebrates are chordates – and all tetrapods are vertebrates – and all amniotes are...

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Biology

All the vertebrates are chordates – and all tetrapods arevertebrates – and all amniotes are tetrapods. Each of these leadingto the amniotes resulted in major morphological change.

a) How do you explain the major differences in terms ofevolutionary selection for each of these groups?

b) Why are intermediate organisms (like the Tiktallik) oftenspecies which don't survive for long periods in the fossilrecord?

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