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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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. There is no hard and fast rule regarding this subject.

rule that is difficult
rule that is fat changing
rule that cannot be broken or modified
rule that can be broken or modified

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