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Question

Which one is common feature of Amphioxus, frog, seahorse and crocodile?
  1. Skeleton of cartilage and bone.
  2. Pharyngeal gill slits at least in developmental stages.
  3. Dorsal solid nerve cord.
  4.  Three chambered heart.


Solution

The correct option is B Pharyngeal gill slits at least in developmental stages.
This is one form of respiration in developmental stages.

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