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प्रश्न
How many chambers are there in the heart of a mammal?
अति संक्षिप्त उत्तर
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उत्तर
A mammal has four-chambered heart. The upper two chambers are called atria and the lower two chambers are called ventricles.
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अध्याय 1: Life Processes - Exercise 3 [पृष्ठ ८९]
