Which two structures would provide a positive identification of a plant cell under a microscope?

a, endoplasmic reticulum, chloroplasts
b, large central vacuole, flagelum
c, cytoskeleton, cell wall
d, chloroplast, large central vacuole

explanation:

on disadvantage of hydroelectric power is the cost. another disadvantage of using hydroelectric power is finding a water source powerful enough to harvest hydroelectric power.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.