Idiom
To take the bull by the horns

To bypass the legal process and take action according to one's own whims
To grapple courageously with a difficulty that lies in our way
To handle it by fierce attack
To punish a person severely for his arrogance

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Idiom
Which statement regarding the mammalian heart is correct?

Blood is pumped from the heart via the atria
When the right atrium contracts, it forces blood into the left atrium
Oxygen-loaded blood moves only through the right side of the heart
In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs

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Idiom
Mutation is

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

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