It can help them find relatives. If someone really wants to know wether or not they are blood related to another person, DNA analysis would help with that. (Like finding out if someone is a parent of a child.)
Answer:
They are friends.
Explanation:
They are speaking to each other in the manner that friends do. They also were studying together which also says something about how close they are.
Hope this helps!!
Answer:
First, adjust the rearview mirror, then fasten your seatbelt.
Explanation:
I hope this helps :)