Bipedalism was the first trait that humans evolved. Bipedalism is an organism's ability to move around and stand on two feet. About six million years ago, humans started walking on two feet. …show more content…
Brain size started rapidly increasing about 800,000 years ago. Brain volume started at about 500cc3, 3.5 million years ago and has grown to be about 1500cc3 today. This was caused by the humans having to adapt to their changing climates. When humans moved out of Africa and spread out around the globe about two million to 800,000 years ago, they had to adapt to survive in their climate. This made the humans brain's flexibly, which made their brain size increase. When fired was first discovered about 1.8 million to 800,000 years ago, this allowed humans to cook their food, which allowed for more brain growth. Bigger brains help the humans to survive in the rapidly changing environment. As brain size increased, language evolved, which allowed for communication and interaction between people to happen. In addition, having a bigger brain allowed for the humans to make more intricate tools and to start creating art. Brain size increasing allowed for the humans to become more able to survive in their