In this history of life worksheet, students will use diagrams of the Precambrian, Paleozoic, Mesozoic, and Cenozoic Era to complete 4 fill in the blank statements.

This interesting tour examines how life began on earth, provides images of the first life forms, and delves into the role that photosynthesis sexual reproduction, and natural selection played in the the Precambrian period. Listen to...

Explains what stromatolites are, their formation from colonies of cyanobacteria, their evolutionary importance, and where they can be found living today. Thrombolites are similar to stromatolites but form differently. They can also still...