Idiom
Biotic component of the environment does not include-

Animal system
Micro-organism system
Plant system
Soil 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. To keep the wolf away from the door

To hold the difficulties and dangers in check
To keep away from extreme poverty
To keep alive
To keep off an unwanted and undesirable person

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