Which of the following is a mammal?
  1. Whale
  2. Snake
  3. Grasshopper
  4. Protozoon
  5. Chicken
Explanation
Answer: A, Whale. Mammals are characterized by having mammary glands and giving birth to live young. Of the animals on this list, only whales fit that description.

Key Takeaway: Mammals are also characterized as being vertebrates. The chicken is a type of fowl, that like other fowl gives birth to hard eggs. The snake is a reptile, which gives birth to soft eggs. The grasshopper is an invertebrate insect with a hard exoskeleton. The protozoon is a unicellular organism without specialized cellular components.
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