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Which of the following statement is true...

Which of the following statement is true w.r.t. fishes?

A

Protopterus respires by lungs only.

B

Fishes like Magur lack swim bladder, so they have to swim constantly to avoid sinking.

C

Study of only skates, rays and sharks is known as Ichthyology.

D

Dog fish bears homodont teeth, which are modifies placoid scales.

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