What were quills made out of and what were they used for?

Answer - Quills were made out of moulted flight feathers (mostly from the wings) from a big bird. They were used in the early days for writing. An early form of a pen.

People would sharpen the end of the feather and dip it in ink. It was a form of writing known as calligraphy.

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just finished this it is b. centrifugal force

its c not d   tell me if that´s correct