GEOL 1003 Chapter : GEOL 9-26
Document Summary
9/26/2012 9:31:00 pm: charles darwin"s contribution, showing that species had originated and evolved in nature (vs being scattered over the planet by an external agent. Different from the notion of fauna change that cuvier had when he studied the oaris basin: proposed a mechanism: natural selection (similar to human"s selective breeding) Speciation large # of species, blocked from breeding, can interbreed and become a new species. Pseudo-extinction not technically extinct, they still exist, but are so different genetically that they can no longer inter-breed. The evolutionary process is very dynamic; no uniform rate: new species tend to be very diverse when they first emerge, then many die out and only a few survive. Forms a bush of life if you chart out the different species evolutionary history. Old and new groups occupy different niches, predators take time to develop. Evolutional radiation new mode of life or extinction of a dominant group.
