Question

mammals need for chambered heart while fishes have only two chambered heart justify​

Answer 1

bcoz mammal constantly use energy to maintain their body temperature

Answer 2

because mammals need to maintain their body temperature according to the temp. for which they need oxygen and de-oxygenated blood to be separated. 4 chambered heart has different place for oxygenated blood and deoxygenated blood. while 2 chambered hearts do not have diff. places for this because fish is a cold blood animal and it keeps its body same temp. which is outside the body.So it doesn't need a 4 chambered heart which supplies oxygenated blood seprately to make its body warm as it happens in mammals body.

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