3. Briefly write what advantage a mammalian heart has over a reptilian/amphibian heart (2)न्यू
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Answer:
mammalian heart is 4 chambered which completely seperates oxygenated and deoxygenated blood
Explanation:
whereas amphibians have 3 chambered heart - mixing of oxygenated and deoxygenated blood which causes minimum timing of contraction of atria
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