Actors must learn how to control pitch, volume, pace, and what else? Articulation
Sound effects
Coughing
Vocal strain

Explanation:

as an actor, you must learn to control the number, length, and direction of your pitch changes observe others notice what different emotions do to the pitch of their voices. The relative strength, force, or intensity with which sound is made.

so, not gonna do the actual thing because that's just laziness for an easy assignment like this.

but someone that has a lot of information and interesting details about is picasso. you can easily write a 500 word essay about him and how overtime his paintings of himself got more and more deformed representing that he was forgetting what he looked like and that was from memory.