The prostomium.
keeps it alive
it keeps the claw from getting caught on things.
It is the nature of the universe; the universe keeps getting older and so does everyone and everything in it. It's the nature of things.
Because the population keeps getting larger.
gravity keeps things in orbit
so you bagge keeps things in and storaged, what keeps things out and available?
Well, not everything, but most things like: Bugs, birds and other animals. And it keeps you from getting wet when I rains and...getting a sunburn. Dunno what else to list...
sprinkler
A healthy lifestyle is one that keeps you healthy. This would include things like eating a healthy diet and getting moderate exercise.
the epiglottis
Bullet for My Valentine - All These Things I Hate
gravity keeps us in a circle