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Ans 10:
Class : Class 7
It is b as first class lever are L-F-E which means fulcrum is between load and effort thus the ans. is scissors, claw hammer, pliers which is option B.
Ans 12:
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Ans 2:
Class : Class 8
Keratin is found in both animals and birds. So the answer is Keratin. Biotin is also an insoluble pigment found in bird's feathers, but it is not a protein.