原题
Fossils provide invaluable evidence of evolutionary history, documenting species that lived millions of years ago. Paleontologists examine these remains to understand how organisms have changed over time. Natural selection expl how advant traits incr in freq in a popul. Species ad to th environments, wh leads t incredible dive observed in the biological world today through the mechanism of natural selection. The ongoing study of evolution continues to reveal how life on Earth has developed and diversified.
参考答案：ains ageous ease uency ation apt eir ich o rsity
解题思路
老师暂未填写解题思路。