Answer:
A. A genetically engineered crop that is resistant to insect pests could also harm helpful insects. 
B. Crops can be genetically engineered to have useful traits that are not found in wild populations,
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Answer: Whether the culprit were too much sunlight or not enough, if photosynthesis stopped, plants would stop converting carbon dioxide -- an air pollutant -- to organic material. 
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I guess metaphase? but i’m not sure since all of them are the phases of mitosis