Are nucleic acids proteins

Proteins are polymers of amino acids while nucleotides are sugar molecules covalently bonded to nitrogenous bases, which can be either a purine or prymidine

"a.) well–developed vascular system."

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms