CHAPTER 16 The Origin and Evolution of Microbial Life: Prokaryotes and Protists. 4.8 BYA - earth The early atmosphere probably contained H 2 O, CO, CO 2 , N 2 , and possibly some CH 4 , but little or no O 2 – reducing atmosphere. Figure 16.1A. = 500 million years ago.
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CHAPTER 16The Origin and Evolution of Microbial Life: Prokaryotes and Protists
= 500 million years ago
Earliest animals; diverse algae
Earliest multicellular eukaryotes?
Accumulation of atmospheric
O2 from photosyntheticcyanobacteria
Billions of years ago
Oldest known prokaryotic fossils
Origin of life?
Formation of Earth
classified by shape & clustering
… a little bit of left-over life…
TMV and other viruses often destroy chlorophyll – unique coloration