4. When Earth is closest to the sun, the Northern Hemisphere is in winter. A. Why is this true?

B. Given the effects of precession, will this still be the case in 13,000
years? Explain your answer.

Witch type of microscope is used to view very small cell components like proteins and dna?

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 is the correct order of cell division? include what happens in each phase