Answer these questions in the document

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully