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Dragonflies used to get to a two-foot wingspan. They don't anymore. The atmosphere was thicker and contained more oxygen. What works once life is established o
by DoreenMichele 3y ago
Dragonflies used to get to a two-foot wingspan. They don't anymore. The atmosphere was thicker and contained more oxygen.
What works once life is established on land can be different from what it took to transition to land and that's what I'm asking about.
- eru 3y agoThere was more oxygen in the air when the dinosaurs roamed, but not when insects (and other critters) first came on land. https://forces.si.edu/atmosphere/02_02_06.html https://forces.si.edu/atmosphere/02_02_06.html says > As plants became firmly established on land, life once again had a major effect on Earth’s atmosphere during the Carboniferous Period. Oxygen made up 20 percent of the atmosphere—about today’s level—around 350 million years ago, and it rose to as much as 35 percent over the next 50 million years.
- DoreenMichele 3y agoIrrelevant.
- deleted 3y ago[deleted]
- eru 3y agoHuh? The high oxygen levels you mentioned occurred long after life had successfully made its way on land.