It's the lack of milk in a person's diet many people in Africa can't afford milk. That's the best I can do, I don't know the subject very well
Answer:
The answer is- A). Because it takes tremendous effort to break free from the laws of gravity to exit the Earth's atmosphere.
Explanation:
I really don't have an explanation. Except that I love science and I actually pay attention in my classes.
The renewable energy source is Hydroelectricity.