Help me i suck at biology 1.Biological evolution is the change over time of populations of organisms
2.Sometimes, sedimentary rocks are removed by road construction, volcanic eruptions or earthquakes. How might scientists determine the age of fossils found in these conditions?
3.Extinctions can be caused by gradual environmental changes, such as mountain formation, orones, such as volcanic eruptions.
4.During what eon and era did the Silurian period occur? Use the words eon and era in your answer.