Answer:
Genetic engineering of both plants and animals can cause food to be more abundant and can restore nitrites to soil in the case of plants and animals can create more stable environments by eradicating invasive species, however, there are concerns about improperly modified crops causing cancer in humans, they may overtake the genetically "pure" crops in the area, and animals have the concern of ethics and cancer.
Step-by-step explanation:
Genetic engineering is generally seen as the future of food. It can serve as a cure for world hunger, causing enough food to be produced in a small enough space to provide for most of the world and causing plants to adapt to inhospitable growing conditions, however, there are concerns. For one, when genetically modifying animals, there may be the concern of how much body mass you can ethically put on an animal before it becomes torturous. You also have to worry about animals genetically processed to produce more meat developing cancerous growths due to their predisposition to gain more mass quickly, however this can be remedied. Animals, on the positive end, can be designed to feed off of invasive, harmful species. Plants may overtake their genetically "pure" cousins, however that is not necessarily a bad thing, as plants are equipped to evolve anyway, and it's quite possible you're just giving the plants a head-start.