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Q 1887780687.     Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because -
(a) bacteria arc resistant to the toxin
(b) toxin is immature;
(c) toxin is inactive;
(d) bacteria encloses toxin in a special sac.
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)