You've taught me something about being respectful of others and proselytizing and I hope I've taught you something about science. Please do ask your father about the bacteria thing and don't stop asking questions. Questions are important :)
I read up on this just a few nights ago, and got some clarification, because I had seen there was some confusion in some profile posts that wasn't cleared up. Environmental condition is organisms changing their environment, e.g. water plants photosynthesizing, resulting in more oxygen being in an aquarium.
It seems like it's almost the opposite, to me. Rather than organisms adapting and changing over time to fit their environment, the organisms change their environment. It's not always a change to better fit the organism, and I'm sure it goes hand in hand with evolution, but it's sort of the other way around, in a way.
Gehenna humans don't really evolve much anymore, because there's not much that kills us. I suppose in the long term we might evolve to beat cancer, but there's no way of knowing.
It only does that in rare cases. Those cases are far too few and far between for humans to evolve significantly against it. Much of modern medicine allows us to get vaccinated against diseases, eliminating more of the need to evolve to prevent the spread of disease.
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