Their, since the sentence is refering to two people.
The best answer is B because they later get along.
Answer:
Isaac Newton changed the world by adding scientific and mathematic knowledge to the world that we still use today. Isaac Newton figured out the principal of gravity and develop the universal law of gravitation. This changed the world because he didn't only establish a law of gravity for one specific place, his law was universal.
Answer:
Because it help us to know where we going is safe or bad
Explanation:
Because i know how to do it