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My teeth are sharp, my back is straight.
To cut things up, that is my fate.
Question: What am I?

I build up castles.
I tear down mountains.
I make some men blind.
I help others to see.
Question: What am I?

You use a knife to slice my head.
Weep beside me when I am dead.
Question: What am I?

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Dinosaurs and prehistoric animals

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