They are found worldwide in tropical and warm coastal waters, lagoons, and coral reefs.
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A subject in literature is the first part in a sentence about what the whole paper, essay, etc is going to be about. Hope this helped.
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It washes your clothes and saves you time from washing them by hand.
His sister waved around the tree.
Segregation; the two different races are being segregated (separated) from each other. Hope this helps :)