ElI5 why dinosaurs were so big and now everything on land is rather small
In: Biology
The atmosphere contained much more oxygen (as much as 35%, compared to about 20% today). This allowed many animals to be larger than their modern equivalents, because their size was not (as) limited by three efficiency of their lungs. For example, there were dragonflies the size of hawks!
https://askanearthspacescientist.asu.edu/oxygen-animal-evolution#:~:text=But%2C%20the%20success%20of%20animals,dragonflies%20the%20size%20of%20hawks!
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