Is there any science word that i can use on google

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic

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.

How do all types of diffusion/passive transport actually ‘work’ without using even the smallest amount of cellular energy?