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N

nowhere

not in, to or at any place

nuclear

of or about the energy produced by splitting atoms or bringing them together; of or about weapons that explode by using energy from atoms

nucleic acid

a molecule that holds the genetic information necessary for life; there are two kinds of nucleic acid: DNA (deoxyribonucleic acid) and RNA (ribonucleic acid)

nucleus

the center part of an atom or cell

number

a word or sign used to show the order or amount of things

nutrient

a food or substance that makes plants, humans or animals grow

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