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Question

Which of the following animals is a fish?

A
Dogfish
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B
Starfish
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C
Silverfish
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D
Jellyfish
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Solution

The correct option is A Dogfish
Starfish is an echinoderm. Silverfish is an arthropod. Jellyfish belong to the phylum Coelenterata. Dogfish are true fishes that belong to Pisces. They have the following characteristics of fishes:
1) They have a streamlined body, fins, and a tail.
2) Their skeletons are made entirely of cartilage,
3) They lay eggs,
4) They breathe through gills.
5) They are cold-blooded.
6) They have two-chambered hearts.
Thus, the correct answer is option A.

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