Originally Posted by Ender the Xenocide
Not true, early hominids did not use tools and managed to evolve into modern humans.
Early hominids also had a lot of adaptations we don't have now(fur, size, etc.). While yes they evolved into us as we got more intelligent we lost a lot of the natural defenses that would have kept us alive without us using our intelligence and tools. Perhaps we would survive in the tropics but hunting and gathering would be difficult because we can't kill things as easily as we normally would have with a spear or some other weapon. There would be little to no farming unless we tilled land by hand.
Our predecessors survived and evolved into beings that are good at making tools so we no longer needed biological advances to survive. If we lose our tools we are probably the most vulnerable species on the planet.