CHAPTERS 13, 17, 18, 19, 20
Chapter 13 – Notes
Modules 13.8 - 13.10 - Evolution : In the Beginning
Earth probably began as a molten mass
The mass thens sorted into layers of varying densities, with the least
dense material on the surface, solidifying into a thin crust.
Earliest evidence of life on earth (fossils) is around 3.5 billion years ago
Stromatolites - rocks that dominated the shore lines
Prokaryotes that built them bound thin films of sediment together,
migrated to the surface and started the next layer.
Life arises from non living matter
Many people believe that flies come from rotting meat and fish in the
French scientist, Louis Pasteur in 1862, confirmed that all life arises only
the the reproduction of pre-existing life.
Scientists hypothesize that chemical and physical processes on early
Earth could have produced very simple cells through