Wodering if it was related to oxygen levels in the atmosphere or something else?
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Some scientists have theorized that dinosaurs were so big because of something called the island rule. This rule states that animals tend to get bigger or smaller depending on their size relative to the landmass they live on. So, for example, elephants are much larger than humans because they come from Africa, which is a large continent, while pygmy marmosets are very small because they come from islands off the coast of South America. The same theory could be applied to dinosaurs; if they lived on a large landmass like North America, then they would tend to be larger than other animals. There are other theories as well, such as that dinosaurs may have had high levels of testosterone which made them grow to be large and strong. But ultimately we don’t know for sure why dinosaurs were so big; it’s still a mystery!
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