A clade of tropical birds has a larger number of species

Last updated: 7/8/2022

A clade of tropical birds has a larger number of species compared to its sister clade in the temperate zone. Which of the following can explain this pattern? a. There was a greater amount of cladogenesis in the tropical clade. b. There was a lower rate of extinction in the tropical clade. c. An adaptive radiation occurred in the tropical clade but not in the temperate clade. d. All of the above. e. None of the above.