Why were dinosaurs (and other organisms) so big?

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I understand that in Carboniferous era insects were big because of oxygen but what about other creatures?

Why were some dinos as big as whales? Why were a lot of them many times bigger than elephants? How does it work? If mammals reigned in those eras instead of dinos and insects, would they also be this gigantic compared to modern ones? (Like gigantic sloth but 5 times the size of it?)

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Anonymous 0 Comments

Dinosaurs had the advantage o.f bone structures similar to birds that helped reduce their weight and better support the load. its also though that the environment at the time would have been warmer and more oxygen rich to support larger animals and their metabolisms.

Its also worth noting that you may be overestimating how big and heavy some of these dinosaurs were. Most were actually not that gigantic compared to many of the fauna alive today and alive shortly before humans spread out and began hunting them to extinction. A modern day african bull elephant would be of a similar size and weight class to a Tyrannosaurus and would likely be able to go head to head with one.

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