The purpose of an allusion is to

an allusion is writing about something that alludes to a different peice of work or item an example of this would be "johnny studies all the time hes practically an einstein." this alludes to albert einstein an intellectual historical figure

answer; /// (nutrition) i believe is the correct answer;

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