Answer:
I'm white and used for cutting and grinding. When I'm damaged, humans usually remove or fill me. For most animals I am a useful tool. What am I?
I'm blue at day and black at night. I do contain some creatures born and died. What am I?
Draw fire or fill me; I'm still empty.
I begin with the letter āiā, if you add āaā in front of me, I become a new word with a different meaning, but still sounds exactly the same. What word am I?
If you have me you want to share me. If you share me you don't have me. What am I?
I am your mother's brother's only brother in law. Who am I?