Humans.
Yes; humans are primates.
Homo erectus differs most distinctly from modern humans in their smaller brain size, more robust build, and different pattern of limb proportions. They also had a prominent brow ridge and a flatter cranial shape compared to modern humans.
no
about a third of a humans brain
Yes, all humans have grey matter on the surface of their brain.
Both animals and humans do have reward centers in the brain. Both humans and animals feel happy or pleasure when the reward centers of the brain are stimulated.
Its a little bigger.
It's the size of your fist maybe not even.
For the following reasons 1. Our skin holds alot of our shape = like a cup 2. Most our body is water = 95% of our brain is water
normal humans use only 4% of their brains inestein used 10% of his brain.
No, humans do not have pain receptors in the brain itself. The brain does not feel pain, but it can interpret pain signals sent from other parts of the body.