Why Butterflies are Disappearing
In summer, people in certain parts of the Midwest expect to see Monarch butterflies, but they’re becoming scarce. Experts think that this is because farm fields are now planted with genetically-modified corn and soybeans that are resistant to the herbicide Roundup, so farmers to spray the chemical over the entire crop in order to eradicate weeds. But when they do this, they also kill off the milkweed, which is the butterflies’ favorite food.
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