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Politics : About that Cuban boy, Elian
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To: Master (Hijacked) who wrote (7476)6/13/2000 10:24:00 AM
From: TigerPaw  Read Replies (2) of 9127
 
Why did apes and humans change while chimpanzees remained the same
The forests which were the chimpanzee home did not disappear because of the ice ages, they just got smaller. The chimps who were best at living in the forest took all the prime trees, the rest were pushed out to the margins to starve. Those who's backs and legs permitted them to stand enough to see over the grass while they gather food with their hands survived (the rest died). They had babies who carried the gene for hips and backs that permitted standing for longer times. Also at this time many forest animals were pushed out of the shrinking woodlands, so there was some easy prey which was not well adapted to the grass, this began to favor carnivorous types who could maintain a diet with a shorter intestine and thereby stand up even better. With a shorter intestine these animals could no longer survive on the leaves and fruit of the forest. The chimps, on the other hand, stayed in the forest and ate and slept and bred as they always had.
TP

The story continues with a whole series of advance and retreat of the ice sheets creating periods of isolation and prosperity for the grass nomads, while the chimps remained in the forest as it grew and shrank over the ages.
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