How do you deal with someone who always yells?

My mom always yells, is always angry about something. I'm always on eggshells whenever around her. I never like to ask questions, really simple questions too, (tho I do have to sometimes as there is no other way around it) and I have to prepare myself for her raising her tone or ending up yelling. I don't know how to deal with these interactions and also don't know how to cut her off.

How do you deal with someone who always yells?
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