there are more fossilized mastodon remains from the period before mastodon populations began to decline than from after that period | |
the average age at which mastodons from a given period reached reproductive maturity can be established from their fossilized remains | |
it can be accurately estimated from fossilized remains when mastodons became extinct | |
it is not known when humans first began hunting mastodons | |
climate changes may have gradually reduced the food available to mastodons |
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