Statement 1: By mass, oxygen is the most abundant element in the human body.
Statement 2: It is principally found as $O_{2}$ in the bloodstream.

Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

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Both Statement 1 and Statement 2 are correct, but Statement 2 is NOT the correct explanation of Statement 1.

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Statement 1 is correct, but Statement 2 is not correct.

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Statement 1 is not correct, but Statement 2 is correct.

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Solution

The correct option is D Statement 1 is correct, but Statement 2 is not correct.

By mass, oxygen is the most abundant element in the human body.

Oxygen is found in the human body as oxy-haemoglobinin the bloodstream but not as $O_{2}$

So statement 1 is correct but not 2.
Hence option C is correct.

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Statement 1: By mass, oxygen is the most abundant element in the human body.Statement 2: It is principally found as O2 in the bloodstream.

The correct option is D Statement 1 is correct, but Statement 2 is not correct. By mass, oxygen is the most abundant element in the human body. Oxygen is found in the human body as oxy-haemoglobinin the bloodstream but not as O2 So statement 1 is correct but not 2.Hence option C is correct.

Statement 1: By mass, oxygen is the most abundant element in the human body.
Statement 2: It is principally found as $O_{2}$ in the bloodstream.