Answer:
Adenine nucleotides are added to the end of the RNA strand, forming a tail.
Carbon dioxide is converted into sugars in a process called carbon fixation; photosynthesis captures energy from sunlight to convert carbon dioxide into carbohydrate. ... These nutrients are oxidized to produce carbon dioxide and water, and to release chemical energy to drive the organism's metabolism.
The cranial nerve that carries visual impulses from the retina to the brain is the: optic nerve.
The valves prevent the backward flow of blood.