Intruduction

Humans are bipedal primates belong to the species Homo sapiens. They are the only surviving member of the genus Homo. Humans have a highly developed brain, capable of tool making, abstract reasoning, introspection, and problem solving and have complex language. This mental capability, combined with an erect posture that frees the arms for manipulating objects has allowed humans to make far greater use of tools than any other species. Humans now inhabit every continent and low Earth orbit, with a total population of 6.8 billion.