What is an ecosystem? All the organisms of a particular kind of species and their physical surroundings
A community of plants and animals and their physical surroundings
A single example of a particular species of plant or animal.
All the different places to populations of animals in the area

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.