16. cladistics, the evolutionary relationship between two organisms is determined by (a) analogous structures (b) shared derived characters () homologous structures (d) embryological relationships (e) structural similarity.

Blood made up of red and white blood cells work together to form

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 .

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.