The cell is taking in substances through membrane proteins, without any energy expenditure of its own. The substances naturally
follow their concentration gradient. However, they must go through the protein channels, because they are too large to squeeze through the cell membrane. This process is called A) osmosis. B) endocytosis. C) active transport. D) facilitated diffusion.
Explanation:the lithosphere average ls about 100 kilometers in thickness it is like a eggshell compared to earth total radius making rocks dissolve or melt
