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Ans 12:
Class : Class 3
The clarification is that mouth, pancreas and small intestine are related to food whereas kidney is related to urine
Ans 13:
Class : Class 2
another way to answer this is the way I DID, mouth is external organ and others are internal organ hence mouth is odd.
Ans 15:
Class : Class 9
mouth is the correct answer as it is external organ whereas other organs are internal organs.
Ans 19:
Class : Class 4
the answer is correct as mouth, small insestine and pancreas help in digestive system but kidney dose not understood?