What are migraine headaches thought to be caused by? both genetic and environmental factors
infections of the nervous system
failure of the body to produce enough insulin
pinched nerves

A. both genetic and environmental factors

Explanation:

hope this helps

for me i have felt invisible when i was clearly struggling,or,i made a great achievement ,and,nobody took to notice me either because they just didn't see it,or,people just turned their back on me.i can see a person being invisible by choice,or,without choice like i did.the people who are invisible by choice don't try to talk to people,don't try to make friends,and,keep to themselves.i haven't been one of those people so i couldn't give you a reason.

hope this and can i get bainliest my dude : d