______ eat insects and mosquitoes and protect crops from them.

Earthworms

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Spiders

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Snakes

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Cows

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Solution

The correct option is B Spiders
$∙$ Spiders knit a web with the thread-like structure from their mouth.
$∙$ Insects and mosquitoes that harm the crops get stuck in the spider's web and are eaten by the spider.

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Similar questions

What will happen if −

(a) Forests, scrub and other vegetation is reduced.

(b) Sewage carrying dangerous chemicals enters rivers.

(d) Poisonous substances are overused to prevent insects from destroying a crop.

(e) A dam is built in a famine-prone region.

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