Why is DNA called the universal genetic code? O All DNA is contained in the nucleus of a cell.
O DNA has been found on every planet in our universe.
O All DNA is made of the same building blocks called nucleotides.
DNA is found in animal and plant cells but not in bacteria.

DNA is considered a universal genetic code because every known living organism has genes made of DNA.All organisms also use DNA to transcribe RNA, and then they translate that RNA into proteins. Every living organism uses that same system.

C

Explanation:

answer; a male inherits only one allele of the x-linked gene controlling hair color;

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.