Nervous System. The nervous system is the control center of the human body. It is made up of the brain, spinal cord, and nerves. It receives and interprets stimuli and transmits impulses to organs.Your brain uses the information it receives to coordinate all of your actions and reactions.ervous System. The nervous system is the control center of the human body. It is made up of the brain, spinal cord, and nerves. It receives and interprets stimuli and transmits impulses to organs.
Finding Lucy. Don Johanson describes finding the knee joint in Hadar, Ethiopia, that first indicated a bipedal hominid had lived 3 million years ago. His subsequent expedition led to the discovery of Lucy, a 40 percent complete skeleton of a new species of hominid, now known as Australopithecus afarensis. The final piece of the puzzle was a skull from the same site, which clearly demonstrated that Lucy's kind were small-brained, although they walked upright.
In 2000, the skeleton of a 3-year-old A. afarensis female, which comprised almost the entire skull and torso, and most parts of the limbs, was discovered in Dikika, Ethiopia, a few miles from the place where Lucy was found.y the time it was found, it was the first complete skull of A. afarensis. The rarity of relatively complete craniofacial remains in the A. afarensis samples before the discovery of AL 444-2 seriously hampered prior meaningful analysis of those samples' evolutionary significance.