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. Get down to brass tacks

Start unravelling the mystery
Begin to discuss secret matters
Begin to talk in plain, straight forward terms
Get into the thick of a problem

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Idiom
Which statement regarding the mammalian heart is correct?

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
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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