But finding these fossils has posed many new mysteries .

然而这些化石的发现又带来许多新的谜团。

Fossils usually come embedded in rock .

化石通常是嵌在岩石块中。

Children are often fascinated by fossils and wildlife .

儿童经常对化石和野生动植物着迷。

Fossils of skulls and bones expose anatomical changes .

头骨和骨骼化石揭示了解剖学上的变化。

Darwin collected fossils and beetles .

达尔文收集化石和甲虫。