Idiom
Harassed by repeated acts of injustice. he decided to put his foot down.

to accept the proposal unconditionally
withdraw
not to yield
resign

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Idiom
Which statement regarding the mammalian heart is correct?

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

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