BIOL 123 Lecture Notes - Lecture 19: Earth Mass, Parallel Evolution, Soot
Document Summary
Extinctions destroy unique products of biological evolution. Dinosaurs roam the earth, which disappeared, making mammals dominate. The dinosaurs were good, but were replaced by mammals who did things much better. New species and extinctions would go on for both, and the relative frequencies of extinction and new species, that shows the differences. Dinosaurs have gone extinct, but mammals had too over time. Species aren"t preserved or saved, but there is a parallel evolution. Body form that makes them adaptive to life in the ocean. Not because of the genes but it is a useful morphology to have. Normal biotic diversity is the result of a balance between the processes of speciation and extinction formation. Mammals themselves have gone through repeated extinctions and species. Many of the relatives, emphasize the fact that repeated extinctions and species formation are part of the background. Species that escape extinction tend to disperse widely over large geographic.
