Which of the following is the example of biological control? (a) Co...

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Which of the following is the example of biological control?
(a) Control of mosquitoes by DDT.
\( \mathrm{P} \)
(b) Control of opuntia by a predator (moth), a type of insect.
W
(c) Decreasing the carrying capacity of the habitat by poisoning it.
(d) rescue effect.
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