Answer:
I am always hungry, I must always be fed. The finger I lick will soon turn red. What am I?
A dagger thrust at my own heart dictates the way I'm swayed. Left I stand and right I yield to the twisting of the blade. What am I?
The last man on Earth received a phone call, who was the caller?
I am the kind of an ant that's good at math. What am I?
What can you catch but not throw?
No matter how little or how much you use me, you change me every month.