Idiom
Biotic component of the environment does not include-

Soil system
Micro-organism system
Plant system
Animal system

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Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. He is in the habit of fishing in troubled waters.

aggravating the situation
putting others in trouble
indulging in evil conspirancies
taking advantage of troubled conditions for personal profit

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