Origin and development of human evolution

p Environmental Factors

Dr . Kevin Hunt 's hypothesis on bipedalism indicates the effect of ecological factors . He created the Postural Feeding Hypothesis that point out bipedal locomotion as a habitual action because of the need to adapt in food gathering . Skeletons of early hominids such as Australopithecines give emphasis to arboreal adaptations as long forelimbs seen imply food access and facilitate arm hanging . Another hypothesis , the Thermoregulatory model indicates adaptation to the environment . Unlike Hunt 's hypothesis , Wheeler presumed bipedalism to be an effect of major climate change . When an organism

walks on two feet , a cooling mechanism due to greater wind exposure of the body happens . Same with Wheeler 's theory , Vrba 's Turn-Over Pulse indicate pressure on these creatures to develop bipedalism for the reason of heat dissipation Evidences show that in the beginning of Pliocene period around 2 .5 million years ago , drier conditions and decreased wooded habitats showed on fossils and soil texture support Wheeler and Vrba 's postulates (Jacobs , 2000

Subsistence of early humans in connection with environmental factors has something to do with cold temperature . In for these humans to adapt in a cold atmosphere , they have to obtain meat and fat proteins The two major arguments are hunting and scavenging . Proofs of hunting of early humans are found in cold areas like Boxgrove , England where 500 ,000 years ago , fossils indicate humans catching a group of animals between a watering hole and the side of a cliff then slaughtered them Scavenging or taking carnivores ' leftovers , on the other hand , have been developed by scarcity on food due to increased meat consumption . An evidence of fossils collected on an old archeological site containing bones with tooth marks of carnivores and marks of cutting tools suggest scavenging of early humans . In addition , current excavations at Olorgesailie...