Which of the following waste can be removed by skin?
(i) Water
(ii) Excessive mineral salts
(iii) Urea

(i) only

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(i), (ii), and (iii)

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(i), (iii)

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(iii), (ii)

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Solution

The correct option is B (i), (ii), and (iii)
The skin has sweat glands that secrete a fluid waste called sweat, which contains water, urea, amino acids, glucose, and NaCl. Its pH is 4.5.
So, the correct answer is option B.

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