Geography 2320A/B Lecture Notes - Lecture 7: Continental Drift, Extinction Event, Prokaryote
10 Nov 2016
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Discuss the timeline of evolution of life on earth. Extinction: death of all organisms in a species. Adaptations- specific morphological changes as a result of environmental pressures. Taxonomy: discipline that assigns names to organisms and classifies biological diversity (linnaeus binomials) Bacteria archaea eukaryotes fungi protostomes echinoderms >sharks> fish amphibians reptiles birds mammals (tree of life) 3. 7 billion-life appears (oldest fossil found) maybe 4. 1 (still highly volcanic) L3 hypotheses: life evolved in the ocean-on deep sea vents(heat) and shallow waters (high uv) come from outer space. First life-formation of photosynthesis- co(cid:374)su(cid:373)ptio(cid:374) of su(cid:374)"s energy and oxygen. Formation of more complex organisms from single cell prokaryote to eukaryote (multi cell). Earth formation in one calendar year we evolve on 11:59pm on the last day of the year. Different strain of humans (homo floresiensis) existed on indonesian islands (like hobbit) Estimated 2-100 million current species on earth (most invertebrates) Majority of life has lived and is now extinct.
