Humanity was believe '''Accuracy''' measures how close a measurement is to have shared a last common ancestor with chimpanzees approximately 5 million years ago at the dawning of the Pliocene epochtrue [[value]].==Bipedalism==Our bipedalism This is what evolutionary biologists believe has led to our larger brains and ability to use tools. Walking on two legs frees up both hands to use tools. The ability to use tools resulted in an evolutionary pressure contrast to become more intelligent [[precision]], which has resulted in an increase in brain volume. It is believed that our ancestors developed bipedalism about 4 million years ago. Lucy, an ''Australpithicus'' is fully bipedal at 3.7 million years ago, indicating that a measure of how reliably the trait evolved sometime before thatdata match each other. Her brain size It is only slightly larger than a modern chimpanzeepossible to be accurate without being precise, indicating more time was needed for the Southern Ape to develop into modern manand vice versa.==The Genus ''Homo''==By the end of the Pliocene, anthropologists and evolutionary biologists recognize a species that latter case (precision without accuracy) is classified in our genus, ''Homo''. ''Homo habilus'' or handy man used stone tools and particularly troublesome because it is believed that they had a primitive form of language. Their brain size was half again that of a chimpanzee but still only slightly more than a third of a modern human. Some scientists consider ''Homo habilus'' to can be a late variety of Australopithecus but Homo habilus was an indication that evolution was getting closer hard to modern mandetect in scientific field work. ==PleistoceneSee also==By the beginning of the Pleistocene* [[Accuracy (firearms)]]* [[Scope]], ''Homo ergaster''[[Red dot sight]], what many consider to be the first true human formed. He had a brain capacity almost two thirds of modern man, used more advanced tools, and may have had the ability to control fire. ''Homo ergaster'' or ''Homo erectus'' may have been the first humans to radiate out of Africa about 1.8 million years ago. Around 800,000 years ago humans took on a much more modern appearence. Their brain capacity was around 90 per cent that of modern man, with broad overlap. They used spears and handaxes, wore clothes, cooked their own food, and may have buried their dead. ''Homo heidlebergensis'' which is sometimes classified as late Homo erectus or early Homo sapiens lived during this time between 800,000 and 500,000 years ago. It is believed that he is the last common ancestor between modern man and Neanderthals.[[Laser sight]] [[Category:Science]][[Category:Firearms]][[Category:Firearms Glossary]][[Category:Firearm Sights]]
