In order to go on you need it. In order to leave you must lose it. In order to survive you must protect it. It is doomed by death, cursed from below, yet everything has it. What is it?
its LIFE.
It is bright and yellow and turn on and off everyday, some say they need me but others wish that it would go away. What is it?
Assuming you can't steal an animal's sense of hearing, or use an electrical device, what would you need in order to hear a pin drop from over 20 yards?