Where does mechanical digestion take place?

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

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.

What nerve is affected in bell palsy