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. His biographers discovered to their surprise that he was an atheist to the backbone.

by and large
by birth
to some extent
completely

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Idiom
Mutation is

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

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