A student records his pulse rate at rest and again after exercising for 30 minutes. He repeats this process for 15 days. There is a trend in his pulse rate and a possible explanation. His explanation is known as Group of answer choices

a theory

a hypothesis

raw data

an observation

check for the pregnancy rating of drug. if its class c or d see if other alternatives

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answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

answer; both surfaces of the membrane are nonpermeable