Riddle #379

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what am Itricky

While I am in air, I am not in oxygen. I am also in water, but not in hydrogen. I am necessary in all animals, but you won't find me in the zoo. Look in all brains and you'll find me there too. What am I?
The Letter A.
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If it takes one man three days to dig a hole, how long does it take two men to dig half a hole?
You can't dig half a hole.
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We can be boring, Or interesting. We can be long, Or short. We can have pictures, Or just words. Many love us, But many also hate us. What are we?
Books.
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