Osmosis and diffusion are related in that a. both are methods to stop movement of molecules across a cell membrane b. osmosis is the movement of water across the cell membrane by diffusion c. both involve the movement of large molecules across the cell membrane d. both processes only work in red blood cells

The greenhouse effect a. something that has occurred for millions of years b. an unnatural phenomenon caused by humans that maintains earths temperature range. c. the results of the differences in the angle of the suns rays d. an unnatural phenomenon that causes heat energy to be radiated back into the atmosphere