What is the unique thing about stem cells that makes them so desirable

When is your respiration rate likely to change? a. when your intestines are digesting b. when your cells have too much glucose c. when your cells need more oxygen d. when your liver is working after a meal

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these