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.
It is by nature, soft as silk; A puffy cloud, white as milk; Snow tops this tropical crop; The dirtiest part of a mop
What has one eye but cannot see?
What goes up but never comes down?
The itsy bitsy teeny weeny yellow polka dot variety is quite popular.
It weighs next to nothing but no one can hold it for long. What is it?