. Pollutants such as lead, mercury, sulphur, asbestos, nitrates and many other harmful chemicals…..

This isn’t a full question so i don’t know how to answer it

Ibelieve it is c

During the paleolithic, hominins grouped together in small societies such as bands, and subsisted by gathering  plants  and fishing, hunting or scavenging wild  animals. the paleolithic is characterized by the use of knapped stone tools, although at the time humans also used  wood  and bone tools.