30. Two potential harmful effects of using genetically modified Bt maize include..........

a) humans or farm animals that eat genetically modified maize might be harmed by the bacterial DNA in it or by the Bt toxin.

b) insects that are not pests could be killed. Whether feeding directly on Bt maize or on a plant that has been dusted by pollen containing the Bt toxin, adult and juvenile insects could be affected.

c) populations of wild plants might be changed when cross-pollination occurs with Bt plants. Those wild plants (or weeds) that gain the Bt gene would then have an advantage over other wild plants in the struggle for survival.