I believe that the best answer to this question is d. amino acids.
D. friction pulls the skates wheels westward
It takes 8 electrons to fill a shell.
a specialized cell, group of cells, or organ of endothelial origin that selectively removes materials from the blood, concentrates or alters them, and secretes them for further use in the body or for elimination from the body — compare endocrine gland, exocrine gland.
