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TAKE THE QUIZVertebrata
noun plural
Ver·te·bra·ta
ˌvər-tə-ˈbrät-ə
-ˈbrāt-
: a subphylum of chordates comprising animals (as mammals, birds, reptiles, amphibians, and fishes) with a segmented spinal column together with a few primitive forms in which the backbone is represented by a notochord
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Merriam-Webster unabridged
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- Often used to describe “the march of time,” what does inexorable mean?


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