Biotechnology has a of applications. For example, genetic engineering allows scientists to create new organisms. Genetically engineered crops can more nutrients, resist pesticides, and even have longer shelf lives.

The sentence needs a word meaning “many”: “Biotechnology has a number of applications.” “A bunch of applications” is informal and does not fit as well in this sentence. The missing verb in the next sentence does not change which choice completes the first sentence.

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