Unlike other animals, humans are shaped by society. We possess articulate speech, abstract thinking, and the ability to create tools and culture. 2. Key Theories of Origin
Prove that without social contact during "critical periods," biological humans fail to develop speech, logic, or social behavior.
Mastered the use of fire and began migrating out of Africa.
The first to create primitive stone tools.
The first step toward upright walking (bipedalism).
The parallel evolution of society—moving from primitive herds to tribes, and eventually to civilizations. 5. Distinctive Human Traits
Humans evolved from higher primates through natural selection and adaptation.