Answer: The enzyme or the Catalyst works by combining with its substrate in the activation site and converts it to Products.
They both have something to do with organisms
P700 is photosystem I. It includes chlorophyll a 670, 680, 695, 700, Chlorophyll b, carotenoids. The active reaction center of photosystem is p700, as it absorbs light of a wavelength longer than 680nm.
P680 or the photosystem II has the following pigments: chlorophyll b, 660, 670, 680, 695, 700, phycobilins, and xanthophylls. The active reaction center, in this case, is p680 of chlorophyll a, as it absorbs the light having a wavelength shorter than 680nm.
Those are both examples of ecological services!
Can you provide the graph? I can't answer the question if I don't know what it is ^^