BIOL 1202 Chapter : Biology1202
Document Summary
Simplest explanation is the most likely one around 11 million species in world planet 4. 6 billion years old life has been reproducing close to that time, 600 million years later life happened by chance, chemical evolution. 1(single prokaryotic organism) species to 11 million, evolution (change), around 50 trillion cells in human, about 500 trillion microbes. 500,000 years ago something similar to homo sapien simplest explanation based on fossils evolved from fish. - people thought new living things appeared all the time. - mid 1800s louis pasteur (broth boiled in flask killed pre-existing microorganisms;broth cools condensing water collects,sealing the mouth of flask; if neck is later broken off, outside air can carry microorganisms into broth) Atmosphere: of the many gases, o2 and o3 were absent, similar to jupiter. Frequents storms w/ lots of lightening due to evaporation and condensation. Chemical evolution-chemicals changed over time due to the changing atmosphere, heating, cooling. Radiometric dating of meteorites & moon rocks.
