A)assertion and reason both are true but the correct explanation is reason of the assertion. B) assertion and reason both are true but the correct explanation is assertion of the reason . C)assertion is true but reason is false . D)reason is true but assertion is false . REASON the mucous is like the grease put on the ball bearings of cycle tyres. ASSERTION in snail , the muscular foot produces slimy mucuos.
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the answer is option B
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