Idiom
To wrangle over an ass's shadow

To quarrel over trifles
To do something funny
To act in a foolish way
To waste time on petty thing

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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
When the right atrium contracts, it forces blood into the left atrium
Blood is pumped from the heart via the atria
Oxygen-loaded blood moves only through the right side of the heart

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