If a portion of a messenger RNA molecule contains the base sequence A-A-U, then the corresponding anti-codon on the tRNA base sequence is

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.

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answer; lower are;