What are three key changes in vertebrate evolution from aquatic to terrestrial h

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What are three key changes in vertebrate evolution from aquatic to terrestrial habitats ?
Did limbs first evolve from terrestrial or aquatic vertebrates? According to your answer, are they an adaptation or exaptation? Mention at least one of the extinct tetrapods relatives considered transitional between fishes and tetrapods.
Mention two major documented extinction of mammals. When did they occur and why? What are three key changes in vertebrate evolution from aquatic to terrestrial habitats ?
Did limbs first evolve from terrestrial or aquatic vertebrates? According to your answer, are they an adaptation or exaptation? Mention at least one of the extinct tetrapods relatives considered transitional between fishes and tetrapods.
Mention two major documented extinction of mammals. When did they occur and why?
Did limbs first evolve from terrestrial or aquatic vertebrates? According to your answer, are they an adaptation or exaptation? Mention at least one of the extinct tetrapods relatives considered transitional between fishes and tetrapods.
Mention two major documented extinction of mammals. When did they occur and why?

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What are three key changes in vertebrate evolution from aquatic to terrestrial habitats ?

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