Passage Summary: Boats make a lot of noise that sounds like whale talk. Even though the whales seem fine and don't swim away, the noise is actually loud enough to make them go deaf over time.

Reasoning: Boat engines make noise in the same frequency range whales use to talk; whales don't change their behavior around boats; the noise is loud enough to cause long-term hearing damage.

Analysis: The stimulus presents a contrast between a lack of behavioral change and the presence of physical harm. The whales do not 'behave differently,' yet they are still suffering hearing damage. This implies that outward behavior is a poor indicator of whether the whales are being negatively affected by the noise. Look for an answer that concludes that we cannot assume whales are safe just because they aren't fleeing the area or changing their communication patterns.