Name the population you want to study, for instance, "all people aged 18 – 22 in the United States" or "all professional baseball players in the National League."

All professional ballerinas.

Explanation:

To see how they achieve near perfection from their stretches and exercises to Thier rehearsals and onstage. How they take care of a hectic schedule and deal with the pain that comes with being on pointe up to 8 hours a day.

characterization of nanoparticles is a critical step in nanomaterial production as it provides information of dimension, morphology, surface charge, distribution and degree of surface functionalization.

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explanation:

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