Which describes the role of oxygen in photosynthesis?
• It is a reactant, so it is released by the plant.
O It is a
product, so it is released by the plant.
• It is a reactant, so it enters the plant.
• It is a product, so it enters the plant.

The model illustrates a process by which a substance is taken up by a cell. which statements describe the process? a. the model shows the process of endocytosis. b. the process shown in the model requires energy from the cell. c. the cell membrane in the model remains intact throughout the process. d. the model shows the process of facilitated diffusion.