Answer:
The answer is RNA. Only RNA has one single strand, DNA has 2
Answer:
protein is the right answer
Explanation:
B is the right answer because none to the others sound like a real solution
Carbon dioxide is returned to the atmosphere primarily by respiration of humans, (exhalation to be precise). The return of carbon dioxide to the atmosphere is also possible by the decay of plants and animals and combustion, which is the process of burning something.