那么这些细胞是如何分化并形成像根、茎、叶和果实那样不同的结构的呢？

How then can these cells differentiate and form structures as different as roots, stems, leaves, and fruits?

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恐龙在很早以前就从鳄鱼家族的家谱中分化出来了，这一论点是古生物学家在周三根据新发现的二百四十万年前的祖龙化石提出的。

Dinosaurs split off early from the crocodile family tree, paleontologists suggested Wednesday, based on the discovery of a 240-million-year-old fossil "archosaur."

youdao

这并不能排除贾第虫属和副基总目的早期分化，回答这样的问题需要知道真核生物树的根在哪里，这是个难题。

This does not preclude an early divergence for both Giardia and parabasalids, for this depends on where the root of the eukaryotic tree lies, which is difficult to resolve.

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