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The mitochondria I’m pretty sure
Well, there are many species that live and are dependent on the rain forest to survive. If you wreck the ecosystem, then you wreck loads of species-because they are all connected, and the whole forest suffers. Preserve it, and you preserve millions of species.
I hope this helped. :)
Leeuwenhoek was the first know person to see living cells, through a microscope he created.