You need: YOUR HEART, LUNGS, SMALL INTESTINE, LARGE INTESTINE, GULL BLADDER and SOME MORE!
They need to stay alive to support the organism
WEll your body is a bunch of organs and 1 of em keeps your skin cells alive
Oxygen is needed to stay alive. Without it you suffocate.
The four thing you need to stay alive are: Oxygen, water, Food, and Air
Enviorment
To stay alive
they need a lot of energy
breath and crap like that
to stay alive
Water to swim in
The Romans needed water, food and shelter to stay alive just like everyone else.
because you need energy to power you're organs and muscles to stay alive (not eating does not cause quick weight loss it means you're body will no longer function correctly)