And B. physical systems because there are volcanoes, oceans, land, mountains, forests
Many African Americans struggled in the years after the civil war.
Answer:
Hand dexterity that allowed humans to create changes to their environment. This included cooking food and creating complex tools. Cooked food provided much more and better protein at less work. This meant that humans could spend their time on things other than chewing food.
This would be a professional career pathway.
