这里的 we can learn from.是个定语从句,先行词是 fossils,省略关系代词that / which了.
因为它在从句里做宾语（from的宾语）.
如果在learn后面加上一个a lot,则句子更妙.
希望能帮到你,祝开心(*^__^*) !
after millions of years,fossilization creates fossils we can
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