Educação Superior::Ciências Biológicas::Biologia GeralEducação Superior::Ciências Biológicas::EcologiaPresents a lecture of Professor Stephen C. Stearns that talks about coevolution. There are coevolutions at various levels such as species, the most common, organelles, mitochondria and chloroplasts.The coevolution can be useful (symbiosis) or harmful (parasitism). Several factors influence the coevolution, as the frequency and degree of interaction