Idiom
Branch of science which deal with the study of causative agent of disease is

Ecology
Etiology
Eugenics
Euthenics

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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 work hard to achieve one's aim
To advance one's position in life
To afford hope or ground for expecting a good result

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