Name: Anonymous 2007-06-11 0:46 ID:NohpMLRY
In evolution species usually split as some migrate from regions they evolved to live in to more inhospitable regions. Thus there is much proof of how different species evolve to harsher conditions compared to their cousins in more pleasant conditions. These trends correlate strongly with the migration of humans out of Africa and their brief 50000 years or so of evolution into the mongoloid and caucasian groups which can be identified by forensic science and genetic racial markers along with general appearance. Considerring how long it takes for new genes to appear which affect appearance, the genes which are really important in whether a human survives or not which affect how the brain works must have been alterred to a greater extent.
Populations always grow to fit the food available, there is no easy life as a hunter gatherer unless you happen to be living in times when the population is lower than the resources needed to support it. The difference between species living in harsh conditions and those living in pleasant conditions is in the amount of energy they must expend competing and surviving and since this energy is used in different ways it influences how they evolve. Those who stayed in Africa spent more energy competing with others than the migrants, whilst the migrants had to spend more energy accumulating resources in the first place than their african cousins. Another difference of note is population dispersal. The ice age plains and pine forests had a much greater dispersal of food than the jungles of Africa. There is virtually no food in a pine forest and grazing animals in cold conditions had to travel further than those in Africa.
So what traits make humans good competers and good survivers?
Populations always grow to fit the food available, there is no easy life as a hunter gatherer unless you happen to be living in times when the population is lower than the resources needed to support it. The difference between species living in harsh conditions and those living in pleasant conditions is in the amount of energy they must expend competing and surviving and since this energy is used in different ways it influences how they evolve. Those who stayed in Africa spent more energy competing with others than the migrants, whilst the migrants had to spend more energy accumulating resources in the first place than their african cousins. Another difference of note is population dispersal. The ice age plains and pine forests had a much greater dispersal of food than the jungles of Africa. There is virtually no food in a pine forest and grazing animals in cold conditions had to travel further than those in Africa.
So what traits make humans good competers and good survivers?