iffy thing. Read the first part to get the idea here -
The way to understand our origins is to remember that living organisms are in a state of constant change - It's not that evolution *can* occur, but that it *must* occur, simply because there is no mechanism in living organisms to ensure perfect, flawless reproduction for ever.
Suppose you could study a population of chimpanzees in the jungle, on a timescale of millions of years. Clearly, each individual only lives a few decades, so the population is constantly being succeeded by individuals which are different from their parents, because reproduction is imperfect - and remember, this is *inevitable*. It can't *not* happen. All the time this population is inter-breeding, the genes are getting mixed together, and only genes which work well with all other chimpanzee genes will tend to get passed down to successive generations (because individuals with genes that don't work well together will tend not to survive and reproduce).
2007-10-18
12:55:07
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Anonymous