Practice Quiz

LSAT

Category - Logical Reasoning

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All humans are mammals, and all mammals are animals. All animals are living organisms. Some organisms reproduce asexually, but not mammals. Some mammals live underwater, but not humans.

If all of the above statements are true, then which of the following must also be true?
  1. Most animals are mammals.
  2. All mammals that live underwater reproduce asexually.
  3. No animal that lives underwater reproduces asexually.
  4. Some animals are mammals.
  5. All animals are mammals.
Explanation
Answer: D - It must be true that some animals are mammals. All of the other choices could be true, but don’t have to be. However, if all mammals are animals, then some animals must be mammals.
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