Amutation occurred in the third codon position of a gene, but the protein still functions normally. how is this possible?

The mutation is silent

Explanation:

Silent mutation are those changes that occur to the nucleotide sequence of a deoxyribo nucleic acid without any corresponding change to the phenotype of an offspring.

The change in the nucleotide sequence of a DNA that occur in a silent mutation does not affect the kind of amino acid/protein produced during translation. Hence, the protein still functions normally.

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the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.