The advent of the refrigerator caused the collapse of the ice market. In the past, people used ice to keep food fresh, and now refrigerators have replaced the role of ice. In the same way, due to the results of bioengineering, research on crops that can resist pests will cause what consequences ? Which of the following is the best answer to the above question? ['Reduced demand for chemical pesticides.', 'Increase seed costs.', 'Increase crop yields.', 'The declining value of farmland.']