Biology, 21.07.2019 21:00, edwin3448

The photograph shows monarch butterflies landing on plants where there are thousands of other monarch butterflies. these butterflies feed on milkweed plants as they travel south for the winter, covering distances of 5,000 km or more each year. however, the population of these butterflies has been steadily declining over the last 20 years. what is the most likely reason the population of these butterflies has been declining?

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The photograph shows monarch butterflies landing on plants where there are thousands of other monarc...