Answer:
What can be as big as an elephant but weighs nothing?
I am owned by the poor, the rich do not need me. If you eat me, you will die! What am I?
I am a busy worker who is a water mammal.
I go up and never come down no matter how hard you wish. As I get higher, more wrinkles crawl on to the face. What am I?
I am pronounced as one letter, written with three. I come in blue, black, brown, or grey. Reverse me and I read the same either way. What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.