BIOL 1001 Chapter : Ch 17 Cont
Document Summary
Two/3 major causes of mass extinctions (when a large group of species dies out quickly: climate change. Conational drift - shift of land , caused by plate tectonics earth"s crust divide , the plates shift past on another. Human interaction , biodiversity , over hunting destroying the biome. Very complex: african replacement hypotheses, multi regional origin hypotheses. Small organic molecules brought in from outer space. Multi regional hypo: some level of gene flow occurred geographically . , the different hominids moved around and migrated and then they mixed together and we are left with homo sapiens. African replacement hypo: homo sapiens replaced the other hominids . Genes from homo sapiens migrated from africa and replace others with little interbreeding ) Cultural evolution - things you are taught, and behaviors that are passed down. Technology revelation - tools, shelter, meds , food ,ag ,industrial how human have evolved highly devolved brains, complex social behaviors , abstract thought.
