The endocrine system or the skin (:
Answer:
Deoxyribose, found in DNA, is a modified sugar, lacking one oxygen atom (hence the name "deoxy"). This difference of one oxygen atom is important for the enzymes that recognize DNA and RNA, because it allows these two molecules to be easily distinguished inside organisms.
Explanation:
<span>The number of protons plus the number of neutrons is called the mass number.</span>
