If water is at 3 degrees C and has a salinity of 32.5% its density is __

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

not sure if this what   you'r looking for would be percent composition

which fault and or fold did you find most difficult to diagram