The_evolutionary_causes_of_biodiversity
Environmental conditions play a critical role in determining if an individual will survive and contribute its genetic information to the next generation and how new species will evolve.
Biodiversity_patterns_of_speciation_and_extinction
Over time, species richness has had significant ups and downs. Speciation increases the number of species. Extinction decreases richness.
All video content by Khan Academy is under their license: CC by NC SA
Website created using Khan Academy Static Downloader