Passage Summary: Seals can tell the difference between 'scary' whales and 'safe' whales by their accents. Scientists think baby seals start out scared of everyone and only relax around the safe whales once they learn the right accents.

Conclusion: Young harbor seals are initially afraid of all killer whales but eventually learn to ignore the ones that only eat fish.

Reasoning: Killer whales have different dialects based on their diet, and seals use these dialects to avoid the dangerous seal-eating whales.

Analysis: To strengthen a hypothesis about a learning process, we need evidence of that process in action. If seals 'learn' over time, there should be a measurable difference between the behavior of inexperienced juveniles and experienced adults. Look for an answer that shows younger seals fleeing from all killer whales while older seals only flee from the seal-eating ones. This would provide the necessary 'before and after' evidence to support the biologists' theory.