Manatees and dolphins are both marine mammals that occur in the Tampa Bay region. Like all mammals, they produce milk to feed their young, and like other placental mammals, their young develop inside the mother's reproductive tract with a complex and long-lived placental connection. Both species also display adaptations that are unique to marine mammals, including a flattened caudaul fin, or fluke, used for propulsion. Based on the most current information, manatees are in the order Sirenia, which is most closely related to the order Proboscidea which includes elephants. On the other hand, dolphins are in the suborder Cetacea which is most closely related to the suborder Artiodactyla which includes hippopotamuses. Cetacea and Artiodactyla are grouped together in the order Cetartiodactyla. Based on this information, you should conclude that: Group of answer choices Dophins and manatees are more closely related to each other than either is related to land mammals, and flukes evolved in the common ancestor of dolphins and manatees Flukes evolved independently in the cetaceans and sirenians via convergent evolution. Manatees are the result of a recent hybridization between dolphins and elephants. Manatees acquired flukes due to horizontal gene transfer, which could be confirmed if we show that different genes are responsible for the development of flukes in manatees than in dolphins.