Idiom
Branch of biology in which we study about relationship between living and their environment.

Geology
Genetics
Ecology
Physiology

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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 plough the sands

To busy oneself in a way which cannot lead to any profitable result
To afford hope or ground for expecting a good result
To work hard to achieve one's aim
To advance one's position in life

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