history of life on earth. fig. 25-7 animals colonization of land paleozoic meso- zoic humans ceno-...
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History of Life on Earth
Fig. 25-7
Animals
Colonizationof land
Paleozoic
Meso-
zoic
Humans
Ceno-zoic
Origin of solarsystem andEarth
ProkaryotesProterozoic Archaean
Billions of years ago
1 4
32
Multicellulareukaryotes
Single-celledeukaryotes
Atmosphericoxygen
• Oparin and Haldane hypothesized that the early atmosphere was highly electrical
• Stanley Miller and Harold Urey conducted lab experiments that showed that the abiotic(non-living) synthesis of organic molecules in the early atmosphere is possible
• They spent years researching and trying to recreate a closed system that mimic what they believed to be the conditions of early Earth.
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