A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. The species is the principal natural taxonomic unit, ranking below a genus and denoted by a Latin binomial.

As a quick test of your tetranomial math skill turn 91x⁴+182x³+189x−378 back into factored form (Hint it's really simple.)

Wait, did I just say all that without breaking a sweat?

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