if one strand of DNA has a nucleotide sequence of A-A-C-T-G-T-G, the nucleotide sequence on the complementary strand is what

C-A-C-A-G-T-T

Explanation:

Assuming the  A-A-C-T-G-T-G is top strand reading 5' to 3',

The opposite 5' to 3' would be read C-A-C-A-G-T-T

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.