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Comment: population density (Score 1) 264

by voot545 (#39916959) Attached to: Methane Producing Dinosaurs May Have Changed Climate
"Medium-sized sauropods weighed about 20 tons and lived in herds of up to a few tens of individuals per square kilometer so global methane emissions from the animals would have amounted to around 472 million tons per year, the scientists calculated." How could they possibly know the population density? not to be an ass, just asking honestly

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