Although pocket gophers 'damage' crops, their 'tunneling' aerates the soil, which helps 'conserve' ground water and 'preventing' crosion.

Although pocket gophers 'damage' crops, their 'tunneling' aerates the soil, which helps 'conserve' ground water and 'preventing' crosion. Correct Answer preventing

Parallelism - এর জন্য help - এর পরের verb গুলোর base form বসাতে হবে। সুতরাং preventing - এর স্থলে prevent বসালে বাক্যটি সঠিক হবে।
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