What Am I?Riddles are little poems or phrases that pose a question that needs answering. Riddles frequently rhyme, but this is not a requirement.
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?
AnswerThe Letter A.
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