MCAT Biology

Category - Biology

Every year, monarch butterflies from Canada and the United States spend the winter in central Mexico. The dry and mild climate in Mexico allows the monarch butterflies to survive the winter. One winter, a week of storms caused freezing temperatures and 43 cm of snow in Mexico. What was the most likely impact of these storms on the monarch butterflies?
  1. Monarch butterflies died in large numbers.
  2. Monarch butterflies immediately migrated back to the United States.
  3. Monarch butterflies did not migrate from Canada and the United States the next year.
  4. Monarch butterflies evolved several new adaptations to survive the winter in Mexico.
Explanation
Answer: A - Monarch butterflies died in large numbers.
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