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Q.

Choose the incorrect statement regarding Petromyzon.

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a

Skull is without cranium.

b

Mouth is without jaws.

c

Skin is without scales.

d

Embryo is without amnion.

answer is A.

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Detailed Solution

Petromyzon is a vertebrate (craniate). Cranium and vertebral column are cartilaginous. 

Only reptiles, birds and mammals are amniotes.

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