All cells contain cell membrane. which of the following describes the composition of cell membranes? A.) composed of phospholipid molecules, which provide a flexible structure.
B.)composed of cellulose, which provide rigidity for the cell wall
C.) composed of carbohydrate chain, which allow all materials to enter and leave the cell
D.) composed the cytoplasm, which allows proteins to be excreted by the cell.

PLEASE HELP ME

Cancer cells spread to other parts of the body by entering the bloodstream. which of the following organs could prevent a cancer cell in the bloodstream from spreading, and why? a. the spleen, because it releases lymphocytes into the blood b. the peyer's patches, because they release lymphocytes into the blood c. the lymph nodes, because they release lymph into the blood d. the thymus, because it releases lymph into the blood