system
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human
Integrate relevant data to support the assertion that environmental factors contribute to the decline of bee populations.

The decline of bee populations is a concern for agricultural practices that require pollination, as well as for the overall health of ecosystems.
gpt
According to the USDA, the number of honeybee colonies in the United States has decreased from 6 million in the 1940s to 2.5 million in 2017, and the population decline is believed to be caused by factors such as pesticide use and habitat loss, supporting the assertion that environmental factors contribute to the decline of bee populations.