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Question

Choose the correct answers from the alternatives given.
A four-chambered heart is characteristic of:

A
bony fish
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B
mammals
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C
amphibians
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D
none of these
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Solution

The correct option is B mammals
Fishes and amphibians have two and three-chambered heart respectively and mammals have a four-chambered heart.
So, the correct option is, 'mammals'.

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