Ineed with this question i need as much as propose an explanation for any difference between your resting heart rate and your heart rate after excercise

Very simple. At rest, you have a number of bpm. After exercise, the heart can't return abruptly to the rest speed, and it keeps a faster rate for a while.

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme

option a and d is the correct answer

i hope this u

plz mark as the brainliest answer