Invertebrate Fossils - Lesson 16 - Part 3 of 7

In InvertebrateFossils - Lesson 16 - Part 3 of 7 you will learn about multi-cell advantagesand see and experiment that shows how multi-cell formation works.  Trilobites are also discussed, as is anIllustrated Geological time scale showing organisms from the Pre-Cambrian timeperiod.  An excellent informationalvideo on Invertebrate fossils.