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 was undecided. He let the grass grow under his feet.

moved away
stayed out
loitered around
sat unmoving

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Idiom
Mutation is

a factor responsible for plant growth
a change which affects the offspring of F2 generation only
a change that is inherited
a change which affects the parents

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