MCQ
A common characteristic of all vertebrates is:
- ✓Presence of skull.
- BDivision of body into head, neck, trunk and tail.
- CPresence of two pairs of functional appendages.
- DBody is covered with an exoskeleton.
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$I$. It checks the mixing of oxygenated and deoxygenated blood in heart
$II$. It circulates only oxygenated blood through heart.
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