In which group is there a word which does not belong?
(a) liver, lungs, skin, kidneys
(b) urine, sweat, oxygen, carbon dioxide
(c) butterfly, cockroach, beetle, ant
(d) heart, arteries, veins, capillaries
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Solution
(b) urine, sweat, oxygen, carbon dioxide
Urine, sweat and carbon dioxide are waste products; they are eliminated from the body. Oxygen, on the other hand, is not a waste product.