[Answer] Which of the following is NOT a mammal?

Step 1 : Introduction to the question "Which of the following is NOT a mammal?"

...Dolphins and whales are both mammals. Mammals are warm-blooded animals that give birth to live young, and feed those young with milk. Mammals do not have gills which means that any aquatic or marine mammals need to be able to come to the surface often enough to breathe. In contrast, sharks are a subgroup of fish and have gills allowing them to breathe underwater. Although some sharks do give birth to live young, they do not nurse and they’re not warm-blooded. In fact, sharks don’t even have true bones. Their skeleton is made up entirely of cartilage.

Step 2 : Answer to the question "Which of the following is NOT a mammal?"

Shark:

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