Question

Protochordata have notochords but are not vertebrates. Why?


Birds use their forelimbs to fly. Why?

Answer 1

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Answer 2

Q. Protochordata have notochords but are not vertebrates. Why?

All chordates do have a notochords. Protochordates too have a notochord but only during a few stages of their life.In fact Protochordates  are the first organisms to have a notochord.

Q.Birds use their forelimbs to fly. Why?

Their forelimbs have become modified into wings for flying.