Cetaceans comprise which group?

Cetaceans comprise which group?

• A. Bats
• B. Rabbits
• C. Zebras
• D. Whales, dolphins, porpoises

Answer: (D)

Cetaceans are a group of mammals uniquely adapted to life in the sea. They breathe air through lungs, give birth to live young, and nurse their offspring, just like other mammals, but they have evolved body shapes, flippers, and tail flukes that make them expert swimmers. They are warm-blooded and insulated by blubber, and they include two main lineages: baleen whales and toothed whales, the latter of which encompasses dolphins and porpoises. Because whales, dolphins, and porpoises form this marine mammal group, they are the correct match. Bats are flying mammals, rabbits are small herbivorous mammals, and zebras are land-dwelling hoofed mammals, not aquatic mammals like cetaceans.

Cetaceans are a group of mammals uniquely adapted to life in the sea. They breathe air through lungs, give birth to live young, and nurse their offspring, just like other mammals, but they have evolved body shapes, flippers, and tail flukes that make them expert swimmers. They are warm-blooded and insulated by blubber, and they include two main lineages: baleen whales and toothed whales, the latter of which encompasses dolphins and porpoises. Because whales, dolphins, and porpoises form this marine mammal group, they are the correct match. Bats are flying mammals, rabbits are small herbivorous mammals, and zebras are land-dwelling hoofed mammals, not aquatic mammals like cetaceans.