Darwin expected species to change slowly, but not at the same rate – some organisms such as Lingula were unchanged since the earliest fossils.
达尔文认为物种变化是
，但不是以同样速度变化--一些如海豆芽一样生物从最早化石以来未发生改变。
Darwin expected species to change slowly, but not at the same rate – some organisms such as Lingula were unchanged since the earliest fossils.
达尔文认为物种变化是，但不是以同样速度变化--一些如海豆芽一样生物从最早化石以来未发生改变。
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