Problemthe dinosaurs mammoths giant plants etc are known to, Ask an Expert

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Problem:
The dinosaurs, mammoths, giant plants etc are known to be bigger than modern animals. I wonder why they had been lived and why they are not living now.
I really don't know much but is it something about oxygen balance or something similar?
Please give your opinion for this problem if you have any of the idea.

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Biology, Academics

Category:- Biology
Reference No.:- M91146264

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