21. To reduce the dependence on diffusion, multicellular organisms have A. Reduced cell size and number of cells
B. Developed thinner cell membranes
C. Developed other internal transport systems
D. All of the above

How can active reading strategies you? o a. they can you get into better physical shape. o b. they can you read fewer science articles. o c. they can you understand what you read. o d. they can you avoid reading altogether.