13. What will be the fate of a pesticide once it enters a food chain:
Grains - Mouse —— Cat?
(a) Both A and R are true, and R is correct explanation of the assertion.
(b) Both A and R are true, but R is not the correct explanation of the
assertion.
(c) A is true, but R is false.
(d) A is false, but R is true.
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