Which elements combine to form carbohydrates? A. Carbon, Hydrogen, and Oxygen
B. Carbon, Nitrogen, and Oxygen
C. Carbon, Calcium, and Hydrogen
D. Carbon, Potassium, and Calcium

The cellular plasma membrane is selectively permeable, which means some materials move through it while others cannot. the movement of materials into and out of the cell is called membrane transport. this activity will you identify the different mechanisms of membrane transport