Answer:
Baleen Whale
Step-by-step explanation:
The skeleton displays traits that place it firmly as the first baleen-whale relative known to emerge after an ancient group of whale ancestors called basilosaurids split into two: one branch led to the toothed whales, which include sperm whales (Physeter macrocephalus) and dolphins, and the other to baleen whales. Researchers reported their findings on 11 May in Current Biology1.