Answer:
My life can be measured in hours, I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
A seed am I, three letters make my name. Take away two and I still sound the same.
If I have it, I don't share it. If I share it, I don't have it. What is it?
What is given but kept by the giver?
What is a five-letter word that has brain in it?
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.