Pollen is carried from one flowering plant to another by

Pollen can be carried to multiple flowering plants by animals called pollinators, which can be bees, birds, spiders, or even small mammals!

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