Biology 1001A Chapter Notes - Chapter 20-21: Annelid, Spriggina, Reproductive Isolation
3 Apr 2016
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Certain organisms are more likely to fossilize than others and natural processes destroy many fossils so it is hard to find. Explosion of life in cambrian marks the appearance of skeletons structures that support organisms: early bacteria and plants cell walls easier to identify than animal fossils, early animal fossils: cuticles. David evans: nasal passage for communication resonance sound. Environment determining which body forms would be best suited for success: can be parallel or convergent evolution, convergent evolution: when referring to phylogenetically more distantly related organisms, parallel evolution: when referring to more closely related organisms. In areas with abundance of sunlight and water lack of nitrogen. Insectovores catch insects to obtain nitrogen using sticky traps: sticky traps (flypaper), snap traps, pitfall traps (pitchers) Flytraps found in at least 5 evolutionary lines. Pitches 3 different lines: mostly, carnivorous plants do not share a close common ancestor. African emergence hypothesis: hypothesis proposing that modern humans first evolved in.
