Answer:
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find.
What is yellow, looks like the moon and has seeds?
I fly through the air on small feathered wings, seeking out life and destroying all things.
Both punishment and sweet reward, It will befall both fool and lord. It is a spiritual scoreboard, Your every deed it does record.
Two in a whole and four in a pair. And six in a trio you see. And eight's a quartet but what you must get. Is the name that fits just one of me?
You use it between your head and your toes, the more it works the thinner it grows.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?