Respire Need Nutrients Grow Move Are Sensitive Excrete Reproduce
This section of our website focuses on several human characteristics that evolved over the past 6 million years. As you explore the scientific evidence for these characteristics, you will discover that these traits did not emerge all at once or in any one species. There were important milestones along the way. For example, early humans began walking upright before they began making tools. A rapid increase in brain size occurred before early humans began using symbols to communicate. And all of these traits emerged before humans began domesticating plants and animals.