4 ms·

My theory is that insects got larger because of the higher oxygen. And then everything else all the way up the food chain had to get bigger too.

• mkl 7y ago
  Most dinosaurs were herbivores, so I don't think that works.
  • mrfusion 7y ago
    We’ll consider perhaps the whole carnivore food chain increased in size because the base food source (insects) got bigger. Any herbivores would also have to increase in size to not get eaten.