Which of the following character is found only in mammals?

Four chambered heart.

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A pair of lungs.

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Diaphragm between thorax and abdomen.

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Foetal membranes.

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Solution

The correct option is C Diaphragm between thorax and abdomen.
This is a muscular partition and it helps in respiration.

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What could be the possible explanation for evolution of four-chambered heart in mammals as opposed to two-chambered heart in fishes?

What could be the possible explanation for the evolution of four-chambered heart in mammals as opposed to two-chambered heart in fishes?

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