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

Genetics
Geology
Physiology
Ecology

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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 turn over a new leaf

To shift attention to new problems after having studied the old ones thoroughly
To change completely one's course of action
To cover up one's fault by wearing new marks
To change the old habits and adopt new ones

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