Answer:
Following are the two advantages of endoplasmic reticulum in the cell.
1) Endoplasmic reticulum is an organelle of the cell which is responsible for the production of protein for the cell. This protein is sent to the Golgi apparatus where it is modified and then used by cell where it is needed.
2) Endoplasmic reticulum also helps in removing of toxic substances from the cell. If these toxic substances can't be removed, it causes harm to the cell.
Crossing over occurs between prophase I and metaphase I and is the process where two homologous non-sister chromatids pair up with each other and exchange different segments of genetic material to form two recombinant chromosome sister chromatids. So the answer would be Prophase l. Hope this helps
A. Exhibit a period of rapid growth as the population size increases.