11. Seahorses...

A ...are mammals.

Incorrect! Mammals have hair or fur, secrete milk (females) to nourish of the young, and (typically) birth live young.

B ...are fish.

Correct! Correct!

Next!

C ...are invertibrates.

Incorrect! Seahorses are vertibrates, having an internal skeleton.

D   A and B are true.

Incorrect! Incorrect

E   B and C are true.

Incorrect! Incorrect

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