The posterior region of the mouth is called

The posterior region of the mouth is called oropharynx.

It is the oral part of the pharynx, reaching from the uvula to the level of the hyoid bone.

Explanation:

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .