Many psychologists believe that the facial expressions of human beings:

I believe the correct answer is facial expressions have strong biological ties.

Many psychologists believe that the facial expressions of human beings have strong biological ties. According to them, there are two types of facial expressions:
1. Voluntary, which are learned and socially influenced

2. Involuntary which are believed to be innate, just like few basic emotions such as fear.

acid rain is the answer

your answer should be c, it seems to be the only one that makes sense. mark me branliest : )