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Sloths, which once roamed the Americas, ranged from tiny, cat-sized animals that lived in trees to massive ground sloths that may have weighed up to six tons. The only species we know today are two-to...
Shaking up the fish family tree:'Living fossil' not as old as we thought（图）
shaking up the fish family tree living fossil as old as we thought
2017/9/19
Polypterids are weird and puzzling African fish that have perplexed biologists since they were discovered during Napoleon's expedition to Egypt in the late 1700s.Often called living fossils, these eel...