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FROM THE BEGINING OF TIME
EVOLUTION OF HUMANS
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BEGINNING OF HUMAN EXISTENCE
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TRACES THE BEHINNING OF HUMAN EXISTENCE
IT WAS 5.6 MILLION YEARS AGO THAT HUMAN LIKE STRUCTURES APPERED ON EARTH. AFTER THIS SEVERAL FORMS OF SPECIES EMERGED AND THEN BECAME EXTINCT. HUMAN BEINGS RESEMBLING US ORIGINATED ABOUT 160,000 YEARS AGO. DURING THIS PERIOD HUMANS OBTAINED FOOD BY SCAVENGING, HUNTING OR GATHERING.
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SOURCES HUMAN FOSSILS STONE TOOLS CAVE PAINTINGS
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CHARLES DARWIN 24 NOVEMBER 1859 IN HIS BOOK THE ORIGIN OF SPECIES CHARLES DARWIN ARGUED THAT HUMANS HAVE ORIGINATED FROM ANIMALS A LONG TIME AGO.
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PRIMATES 36 MILLION YEARS AGO A CATEGORY OF MAMMALS EMERGED IN ASIA AND AFRICA. THEY INCLUDE MONKEYS,APES AND HUMANS, THEY HAVE BODY HAIR,LONG GESTATION PERIODFOLLOWING BIRTH ,MAMMARY GLANDS.DIFFRENT TYPE OF TEETH AND THE ABILITY TO MAINTAIN CONSTANT BODY TEMPERATURE.
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EVOLUTION
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PRIMATES HOMINOID HOMINID AUSTRALOPITHECUS HOMO
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DIFFERENCE BETWEEN HOMINOIDS AND HOMINIDS
HOMINOIDS HAVE SMALLER BRAIN QUADRUPEDS,WALKING ON FOUR BUT WITH FLEXIBLE FORELIMBS. DEXETERITY OF HAND WAS NOT THERE HOMINIDS HAVE LARGER BRAIN BIPEDAL LOCOMOTION .UPRIGHT POSTURE AND BETTER DEXTERITY OF HANDS.
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HOMO HABILIS ,TOOL MAKER
HOMO ERECTUS HOMO SAPIEN WISE THINKING MAN
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STAGES OF DEVELOPMENT
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AFRICAN ORIGIN OF HOMINIDS
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AFRICAN A PES ARE MOST CLOSELY RELATED TO HOMINIDS
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AUSTRALOPITHECUS THE TERM COMES FROM LATIN TERM austral AND pithecos
Austral MEANING SOUTHERN AND pithekos meaning ape. THIS FORM OF HUMANS STILL RETAINED SOME FEATURES OF APE LIKE SMALL BRAIN SIZE,LARGE BACK TEETH AND LIMITED DEXTERITY OF HANDS.
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AUSTRALOPITHECUS UPRIGHT WALKING WAS ALSO RESTRICTED AS THEY STILL SPENT A LOT OF TIME ON TREES. THEY RETAINED CHARACTERISTICS SUCH AS LONG FORELIMBS,CURVED HAND ANDFOOT BONES AND MOBILE ANKLE JOINTS. OVER TIME TOOL MAKING AND LONG DISTANCE WALKING INCREASED ,MANY HUMAN CHARACTERESTICS DEVELOPED.
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CLIMATE CHANGE ONSET OF A PHASE OF GLACIATION OR AN ICE AGE WHEN LARGE PARTS OF EARTH WERE COVERED WITH SNOW. REDUCTION IN TEMPERATURE AND RAINFALL GRASSLAND AREAS EXPANDED AT THE EXPENSE OF FORESTS WHICH LED TO THE GRADUAL EXTINCTION OF AUSTRALOPITHECUS AND REPLACEMENT BY HOMO, ADAPTED TO DRIER CONDITIONS.
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HOMO HOMO HABILIS (TOOL MAKER ) HOMO ERECTUS (STANDING MAN )
HOMO SAPIENS (WISE AND THINKING MAN
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POSITIVE FEEDBACK MECHANISM
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