22. A 3.5 kg iron shovel is left outside through the winter The shovel, now orange with I rust, is rediscovered in the spring. Its mass is 3.7 kg. How much oxygen combined
with the iron?

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