Find its a 9 letter word 123456789 if it fails you ll die if you have 234 you can 1234 56 is a disease if you dont 789 then you cant live?

HEARTBEAT

if it fails u die

if u have EAR you can HEAR

TB is a disease

AT means i am at ______ (location) and i will be there at_____ (time)

GENIUS :)