What is a potential problem with the use of transgenic varieties of plants that contain Bt toxin?
A) Bt toxin may be harmful to humans.
B) Bt toxin may be harmful to some beneficial insects.
C) Transgenic crop varieties with Bt toxin are not very hardy and require a lot of care.
D) Transgenic crop varieties with Bt toxin require large amounts of chemical insecticides to grow.
Answer: B
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