Ancient Earth: What Killed the Giant Insects?

A strange menagerie of giant insects and amphibians reigned over the
Earth 300 million years ago. Dragonflies the size of hawks. Centipedes larger than humans. Giant trees stored carbon dioxide, and released oxygen in abundance. Human beings would not
have survived in this high oxygen atmosphere. But for some swamp dwellers, it was ideal.

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5 thoughts on “Ancient Earth: What Killed the Giant Insects?

  1. An insect breathes through it's skin. The larger an insect gets the further the air has to travel to be where respiration occurs. If giant insects ever existed, when running away from a predator they would get out of breath and get killed.

  2. Wouldn't the higher oxygen levels help humans too? Breathe in more oxygen and grow bigger body, muscle, and brain? I assume the risk of getting cancer goes way high too.

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