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 reductions in whale numbers worldwide, so the correct answer is c. commercial whaling.

1. Relevant knowledge points and concepts
- Historical commercial whaling: industrial-scale hunting (19th–20th centuries) with steam-powered ships and factory processing led to very high catches.  
- Population biology: large whale species have low reproductive rates (late maturity, long gestation, small calves per birth), so heavy removal causes long-lasting population declines.  
- Other threats (climate change, noise pollution) negatively affect whales but are more recent or secondary relative to the historical scale of commercial hunting.  
- Conservation response: the International Whaling Commission moratorium (1986) and species protections were enacted because hunting was the primary driver.

2. Step-by-step reasoning
- Industrial whaling occurred for decades; tens to hundreds of thousands of whales were taken globally.  
- Because whales reproduce slowly, populations could not replace those losses year-to-year.  
- This produced measured declines of large magnitudes for many species, prompting international bans.

3. Calculations / intermediate steps (illustrative)
- If a population of 100,000 animals loses 90% to hunting: 100,000 − 90,000 = 10,000 remaining (a 90% decline).  
- With low annual population growth (for example, ~2% per year), recovering from 10,000 back to 100,000 would take many decades even without further mortality, illustrating why heavy hunting caused long-term depletion.

4. Why the correct answer is correct
- The scale and direct removals from commercial whaling are historically and quantitatively the largest single cause of whale population declines; international policy responses targeted whaling specifically because it was the dominant threat.

5. Why other options are incorrect
- a. Climate change: affects habitat and prey availability but has been a more gradual and less immediately catastrophic driver compared with mass hunting.  
- b. Noise pollution: harms behavior and communication but does not directly remove individuals at the scale commercial whaling did.

6. Conclusion
Given the historical magnitude of removals, biological reproduction limits, and resulting international moratoriums, commercial whaling is the leading factor behind whale population declines. Final answer: c. commercial whaling.

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