Compared to standardized tests, a disadvantage of alternative assessment is that it is typically time consuming to set up and administer.

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

i think that d. wind is the answer.   i missed the question when i answered a. currents.