A photopsin is a protein A. of a photopigment within cone photoreceptors.
B. of a photopigment within rod photoreceptors.
C. that is derived from Vitamin E.
D. that allows ions to flow into rod and cone photoreceptors

During the day, plants produce by splitting water molecules in the light-dependent reactions of photosynthesis. at the same time, plants use cellular respiration to produce some of the needed by the light-independent reactions to make sugars. during the night, plants produce because takes place.