It differs from DNA chemically in two respects: (1) the nucleotides in RNAare ribonucleotides—that is, they contain the sugar ribose (hence the name ribonucleic acid) rather than deoxyribose; (2) although, like DNA,RNA contains the bases adenine (A), guanine (G), and cytosine (C), it contains the base uracil (U) .
It is the b. food chain and begins with plant, then animals that eat plants, and finally animals that eat other animals.
Answer:
B) A difference in pressure across a distance.
<span>a. direction in which they carry impulses</span>
