Which of the following is not a source of air pollution related to human activities?
A)
gasoline
B)
garbage
C)
forest fires
D)
radon

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

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.