When a farmer grows cotton containing the gene for Bt toxin, they often leave a strip of non-Bt cotton around the outside of the field for what reason?
A. because the non-Bt cotton does not drive the moths and caterpillars to extinction
B. because the non-Bt cotton grows better
C. to allow some RR bollworm caterpillars to survive and limit selection pressure for resistance
D. to allow some rr bollworm caterpillars to survive
E. to allow the non-Bt and Bt cotton plants to cross-pollinate
C. to allow some RR bollworm caterpillars to survive and limit selection pressure for resistance
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