C. 5 1/2 because <span>A sleep cycle lasts about 90 minutes and during that time we move through five stages of sleep </span>
The main role of chloroplasts<span> is to conduct photosynthesis, where the photosynthetic pigment chlorophyll captures the energy from sunlight and converts it and stores it in the energy-storage molecules ATP and NADPH while freeing oxygen from water</span>
Aerobic respiration takes place inside the mitochondria.
