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which prokaryotic organism shows up as the earliest fossils?

a) archaea

b) echinoderms

c) algae

d) cyanobacteria

Can someone i have no idea of how to do this.

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.

Sequence how oxygen accumulated in the atmosphere and the effect it had on life by completing the flowchart