Fossils, trees, current animals. These all offer insight to the history of life on earth
When you don't know whether an animal was once a Carnivore, Omnivore, or Herbivore, all you have to look for is the teeth. Carnivores have long canines, as well as overall sharper teeth, while omnivores and herbivores contain flat molars.
Answer: "selective permeability" .
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