2. Atoms combine to form molecules. Which of the following is another example of organization among living things? * A. Tissues combine to form cells.
B. Cells combine to form tissues.
C. Organs combine to form cells.
D. Organs combine to form tissues.

The small molecule cyclic amp (camp) takes about 0.2 second to diffuse 10 μm, on average, in a cell. suppose that camp is produced near the plasma membrane on one end of the cell; how long will it take for this camp to diffuse through the cytosol and reach the opposite end of a very large cell, on average? assume that the cell is 200 μm in diameter.