What description is true for both dna and rna molecules?
a. they are types of nuclear acid.
b. they are shaped like a double helix.
c. they are both double stranded.
d. they contain thymine and cytosine.

Plzzz hurry im being timed ! humans, like other organisms, require energy for growth and repair. when cells create atp for energy, carbon dioxide is produced as a waste product. how does the body respond to this process in order to maintain homeostasis? a. the digestive and respiratory systems interact to move carbon dioxide to the lower intestine, where it is transformed into methane. b. the circulatory and digestive systems interact to move carbon dioxide to the stomach, where it to break down food. c. the nervous and urinary systems interact to move carbon dioxide to the kidneys, where it is absorbed into the bloodstream. d. the circulatory and respiratory systems interact to transport carbon dioxide to the lungs, where it is expelled from the body.

What are the student's observations and inferences before he starts his investigation?

Construct at least two possible hypotheses for the student’s experiment.