Passage Summary: Even though there are more seals and fewer cod, the seals don't really eat cod, so they probably aren't the ones killing them off.

Conclusion: The growth of the seal population is likely not the reason for the decrease in codfish.

Reasoning: Codfish make up only a tiny, insignificant portion of what seals actually eat.

Analysis: The argument assumes that the only way seals could hurt the cod population is by eating them directly. To weaken this, we need to find an indirect way that seals might be responsible for the cod's demise. Perhaps seals eat the same food as cod, or seals eat a different fish that the cod need to survive. Look for an answer that provides an alternative mechanism for the seals to negatively impact the cod population.