What is the pattern above called?

It is useful for historians to write narratives so that history can be passed on from their point of view.  think about a story being told in third person, then think about it again being told in first person, by someone who actually experienced the event.

Ithink its convection.hope this plz give brainliest!

Well, a and b together would be negative. b alone would also be negative.

A