Darwin expected species to change slowly, but not at the same rate – some organisms such as Lingula were unchanged since the earliest fossils.

达尔文认为物种缓慢的，但不以同样的速度--一些如海豆芽一样的生物从早的石以来未发生改。

Darwin expected species to change slowly, but not at the same rate – some organisms such as Lingula were unchanged since the earliest fossils.

文认为物种变化是缓慢的，但不是以同样的速度变化--一些如海豆芽一样的生物从早的化石以来发生改变。

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缓，不是以同样速度变化--一些如海豆芽一样生物从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.

认为物种变化是缓慢的，但不是以同样的速度变化--一些如海豆芽一样的生物从早的化石以来发生改变。

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缓慢的，但不是的速度变化--一些如海豆芽一的生物从早的化石来未发生改变。

Darwin expected species to change slowly, but not at the same rate – some organisms such as Lingula were unchanged since the earliest fossils.

尔文认为物种变化是缓慢的，但不是以同样的速度变化--一些如海豆芽一样的生物从早的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缓慢的，但不样的速度变化--一些如海豆芽一样的生物从早的化石来未发生改变。

Darwin expected species to change slowly, but not at the same rate – some organisms such as Lingula were unchanged since the earliest fossils.

达尔文认为物种变是缓慢，但不是同速度变--一些如海豆芽一物从早来未发改变。

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缓慢，但不是以同度变化--一些如海豆芽一生物从早化石以来未发生改变。