When our back molars are impacted in our jaw, they don’t seem very wise! They’re the last teeth to come into place, and having them was helpful to our early ancestors who ate tough, uncooked foods that wore away their teeth. But with cooking and making food softer, the size of our jaws has diminished, often with room for the last molars to form in the jaw…but – ouch! – not enough room to erupt.
Human Characteristics: What Does it Mean to be Human?
Part of what it means to be human is how we became human. Over a long period of time, as early humans adapted to a changing world, they evolved certain characteristics that help define our species today.
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.