There are only two extinct groups of cetaceans: Rodhocetus and Dorudon. True or False Rodhocetus went extinct approximately 40 million years ago. True or False
All the branches that extend to zero on the timeline represent animal groups living today. True or False
Living cetaceans share a more recent common ancestor with hippopotamuses than with extinct cetaceans.
Cetaceans evolved before even-toed ungulates, such as deer and cows. True or False