Which one of the following set belongs to the class Mammalia ?

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Q: 28 (SSC/NA)

Which one of the following set belongs to the class Mammalia ?

question_subject: 

Science

question_exam: 

SSC

stats: 

0,5,18,8,4,6,5

keywords: 

{'kangaroo': [1, 0, 0, 0], 'hippopotamus': [1, 0, 0, 1], 'lion': [1, 0, 0, 0], 'whale': [1, 0, 1, 0], 'bat': [6, 0, 3, 5], 'ostrich': [4, 0, 0, 2], 'penguin': [2, 0, 0, 1], 'set': [1, 2, 1, 0]}

Option 4 (Whale, Bat, Kangaroo, Hippopotamus) belongs to the class Mammalia. The class Mammalia includes animals that possess mammary glands and have hair or fur on their bodies.

Whales are mammals that live in water and have streamlined bodies and blowholes for breathing. They give birth to live young and nurse them with milk.

Bats are mammals that have the ability to fly. They have wings made of skin stretched between elongated finger bones. They give birth to live young and nurse them with milk.

Kangaroos are marsupials, a type of mammal that bears live young at a very early stage of development and then carries them in a pouch on its belly. They also nurse their young with milk.

Hippopotamuses are large, semi-aquatic mammals that give birth to live young and nurse them with milk.

Therefore, option 4 correctly includes animals that belong to the class Mammalia.