Dec 1, 2020
In the past it was suggested that during the Mesozoic, oxygen levels were quite high, a factor that -among others, contributed to the gigatism seen in certain dinosaur clades. Newer studies put this theory in question. You may find this link useful: https://www.natureworldnews.com/articles/4963/20131119/dinosaurs-lived-in-a-low-oxygen-world-study-suggests.htm
