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Manju Kamari
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Fishes have heart which is two-chambered and they exhibit single circulation. Remember, four-chambered heart of birds and mammals exhibit double circulation and three-chambered heart of amphibians and reptiles depicts double circulation also.

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Gokul
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Atomic number of X is 10, so this must be Ne (Neon), a noble or inert gas. This gas has complete octet configuration. Atomic number of Y is 17 as [2, 8, 7], so this must be chlorine (Cl). Chlorine ...

class 10 science mcq solutionsclass 10th science cbsc sample paper