Answer:
Indohyus and Pakicetus.
Step-by-step explanation:
Indohyus and Pakicetus are the extinct species that share a close evolutionary relationship with humpback whales. The differences between Indohyus, Pakicetus and humpback whales is that both Indohyus and Pakicetus have legs and are land animals whereas whale do not have legs and lives in the ocean. The similarities between Indohyus, Pakicetus and humpback whales is that the head of Indohyus and Pakicetus had the distinctive long skull shape of a whale's.