What is an organism's niche? a. its physical surroundings b. its particular species, according to the biological species concept c. its method of reproduction d. its interactions with the living and nonliving parts of the environment

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