Which is the best definition of a complement, in grammar? a. part of the prepositional phrase in a sentence b. a word that complete the meaning of a verb c. a word or word group that shows physical action d. an adverb and the words that follow

The answer is B. A word that helps complete the meaning of a verb.

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Okay, biology isn't exactly my strongest subject (it never has been), but i'm pretty sure the answer is nucleotides. dna is made up of nucleotides. each nucleotide contains a phosphate group, a sugar group, and a nitrogen base. there are four different nitrogen bases: adenine (a), thymine (t), guanine (g), and cytosine (c). a always pairs with t, and g always pairs with c.