it burt
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A desert, mountain range, or a jungle could be. : )
With no natural barriers the villagers could not protect themselves from other civilizations, animals and natural disasters.
The greatest natural wonder in Australia could be considered to be either the Great Barrier Reef or Uluru/Ayers Rock.
cornea
cornea
no wish i could
it could be a cataract but you should take the cat to the vet
It could cause flooding downstream of the barrier.
The ozone layer protects animals from cancer, mutation, loss of food, loss of natural habitat.
Darwins theory of Natural Selection.