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Bushfires
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Are there any scientists out there who can support mhaze's statement?//
I'm not a scientist, but this ain't quantum electrodynamics. It's not even rocket science.
Fire acts as a selective pressure on vegetative populations. Those trees which are better at resisting fire or re-propagating after a fire have a selective advantage over those that don't. I general, trees which survive fires go on to propagate more trees which are good at surviving fires. Those that don't, don't.
I don't know how to break it down any more simply for you simpletons without the use of hand puppets and silly voices. If you can't wrap your head around the concept of evolution by natural selection, it is clear that science is not your forté.