A humpback whale is as mammal while a basking shark is a fish. which taxonomy classification are the same for humpback whale and a basking shark?

Both the humpback whale and the basking shark belong to the same taxonomy classifications at the phylum, subphylum, and class levels.

1. Phylum: Both humpback whales and basking sharks belong to the phylum Chordata.
2. Subphylum: They both belong to the subphylum Vertebrata, as they possess a backbone or vertebral column.
3. Class: Both humpback whales and basking sharks fall under the class Chondrichthyes, which includes cartilaginous fish like sharks, rays, and skates.