Q31 of 525 Page 236

Skeleton is made entirely of cartilage in

Cartilaginous fishes have endoskeleton made up of cartilage, e.g., Scoliodon (dog fish) shark Torpedo, sting ray etc.

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29

Hard calcium carbonate structures are used as skeleton by

 30

Two chambered heart occurs in

 32

Amphibians do not have the following

 33

The feature that is not a characteristic of protochordata?