Match the number with the structure choices are:
right atrium
left atrium
right ventricle
left ventricle
tricuspid valve
bicuspid valve
aortic semilunar valve
pulmonary semilunar valve
pulmonary artery
aorta

answer: when you start thinking negitivly and start having suicidal thoughts

or harming yourself, sadness is part of depression as well as fear and anger combined

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

explanation:

i dont know