Questions 22 – 24. Choose a, b or c as the best answer. 22. The leading factor behind the decline in whale populations is:

Question

BlackTom AI · Accepted Answer

Commercial whaling drove dramatic, direct reductions in whale numbers worldwide, making it the leading factor behind historical population declines.

1. Relevant knowledge points and concepts
- Overharvesting/targeted removal: commercial whaling removed large numbers of individuals faster than populations could replenish.  
- Species-specific vulnerability: long-lived, slow-reproducing species (many whales) recover slowly from heavy exploitation.  
- Historical context: industrial whaling in the 19th and 20th centuries used factory ships and advanced gear, causing steep declines; international measures (e.g., IWC moratorium, 1986) were introduced because populations were critically low.  
- Other stressors (climate change, noise pollution) are important but generally act more gradually or as secondary stressors compared with direct killing.

2. Step-by-step reasoning
- Step 1: Identify the strongest, direct cause of mortality. Commercial whaling directly removes adults and reproducing individuals, immediately reducing population size.  
- Step 2: Compare magnitude and immediacy. Historical catch records and population reconstructions show severe population collapses (many cetacean populations declined by large percentages) coinciding with intense whaling eras.  
- Step 3: Consider alternative causes. Climate change and noise pollution affect habitat quality, behavior, and prey availability but do not account for the rapid, large-scale declines seen historically. They are additive or emerging threats rather than the primary historical driver.

3. Calculations / intermediate steps
- No numerical calculations are required here; the argument relies on documented declines correlated with commercial catch records and recovery patterns following the imposition of whaling restrictions.

4. Why the correct answer is correct
- Commercial whaling caused immediate, high adult mortality and drove many species to extremely low population sizes, a pattern directly tied to recorded whaling activity and alleviated only after international restrictions.

5. Why the other options are incorrect
- a. Climate change: important long-term threat altering prey/habitats, but it did not produce the rapid, century-scale collapses historically observed.  
- b. Noise pollution: disrupts communication and behavior, contributing to stress and possible reduced fitness, yet it is not the primary historical cause of widespread, large-scale population collapse.

6. Conclusion
- Therefore, the leading factor behind the decline in whale populations is c. commercial whaling. This matches the provided correct answer.

Questions 22 – 24. Choose a, b or c as the best answer. 22. The leading factor behind the decline in whale populations is:单项选择题

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