LSAT 102 | Section 4 | Logical Reasoning: Q15

LR Question 15 Explanation

QUESTION TEXT: The southern half of a certain region of the earth was…

QUESTION TYPE: Must be False

FACTS:

1. The southern part of a certain area was covered by water during the Cretaceous.
2. Dinosaurs only lived on land.
3. Plesiosaurs lived in water, during the cretaceous only.
4. No single dinosaur lived during the whole Mesozoic.

ANALYSIS: Remember that we’re looking for something that has to be false. All of the wrong answers could be true or must be true.

___________

1. We have no idea what the northern half was like. Maybe it was also covered by water.
2. We know dinosaurs didn’t live in the southern half. Plesiosaurs might have, since they were aquatic.
3. This has to be true. Plesiosaurs lived only during the Cretaceous.
4. Same as A. We have no idea what the northern half was like. Maybe it was covered by land.
5. CORRECT. This can’t be true. The southern half was covered by water during the cretaceous, so dinosaurs couldn’t have lived there at that time.

Recap: The question begins with “The southern half of a certain region of the earth was”. It is a Must be False question. Learn how to master LSAT MBF questions on the LSAT Logical Reasoning question types page.