A) they make up an organisms physical structure
b) they carry information about how an organism is put together and maintained
c) they store excess carbohydrates for later use
d) they provide an organism with usable energy in the form of atp

The function of DNA is to hold the original genetic code for anything made in our bodies. It holds the code for RNA (DNA to RNA is called transcription). RNA: is single stranded. = ribose sugar + phosphate group + nitrogen containing base (either C,G,A, or U).so iguess its b

the fossil record provides evidence of a common ancestor to many species.