a) 1 only b) 1 and 3 only c) 2 and 3 only d) 1, 2 and 3
Correct Answer: Option (b)
Mammals are the class of vertebrate animals characterized by the presence of sweat glands, including sweat glands modified for milk production, hair, three middle ear bones used in hearing, and a neocortex region in the brain. Sea Cow (Hydrodamalis gigas), also called Steller’s sea cow, very large aquatic mammal. Sea horse is a vertebrate fish. It is warm blooded, gives birth to live young, has hair, and the female produces milk. All these are characteristics of mammals. Hence, option (b) is correct.
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