Passage Summary: While some scientists think the massive Apatosaurus could run fast, the author argues this is unlikely because their leg bones weren't strong enough to handle the pressure.

Conclusion: It is improbable that the Apatosaurus was capable of galloping.

Reasoning: Mathematical models and experiments with modern bones indicate that the leg bones of an Apatosaurus could not have survived the physical stress of a gallop without breaking.

Analysis: In this 'Identify the Conclusion' task, the main point is the author's rebuttal of the paleontologists' suggestion. The word 'unlikely' marks the author's stance, while the subsequent sentences provide the experimental and mathematical evidence used to support that stance. To identify the conclusion correctly, distinguish between the background theory being attacked and the author's specific claim that the theory is probably wrong.