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Crocodile and penguin are similar to wha...

Crocodile and penguin are similar to whale and dog fish in which one of the following features?

A

Possess a solid single stranded central nervous system

B

Lay eggs and guard them till they hatch

C

Possess bony skeleton.

D

Have gill slits at some stage.

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Verified by Experts

The correct Answer is:
D
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  11. In some chrodates, the notochord is modified as the vertebral column. ...

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  14. What will you look for to identify the sex of the following?

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