Chimps and humans diverged millions of years ago. Many of the chimps may not have diverged with the rest of the future homo. Early homo of this divergent time may have evolved to best suit their environment, while the others (chimps) still did things that chimps do not needing to evolve into a bipedal homo. Evolution is always branching off throughout all living things, this includes chimps and humans. We aren't 100% certain why this is we can just make inferences on why this might be. Chimps ancestors might have thrived in the way they were in their environments, while human ancestors could have challenged the ways of the chimp and began slowly evolving and adapting into what we are today. not all changes were good and beneficial but are side effects of the evolution of homo. Chimps today are very well adapted to their surrounding environment in the wild and have some advantages over us as humans (ex child birth). There are always going to be divergence in evolution and chimps and early homo were one of them. The chimps were successful enough to survive this long along with homo. Chimps were able to survive the divergence and continue to survive and thrive today.
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i like how you emphasize their environments. It is interesting too about how these differences might tell us something. Since we are the ones pushing chimps towards extinciton we need to think on these issues in order to save them. the birth angle is interesting. i read a paper awhile back that suggested that humans might have more children who live to adulthood than chimps do. Seems like a area of research that we need to look into more. Great job!
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