Herbicide-resistant crops enable heavy herbicide use, harming ecosystems

Steps:

• Identify the question's focus: genetic engineering products tied to farming practices that lower biodiversity.
• Recall biodiversity reduction occurs via monocultures, pesticide overuse, or habitat disruption in agriculture.
• Evaluate each option: link to techniques like chemical spraying or uniform planting that affect species diversity.
• Select the option most directly causing broad ecological harm through intensified chemical farming.

Why D is correct:

• Herbicide-resistant crops allow widespread herbicide application, killing non-target plants and insects, which disrupts food webs and reduces species diversity per ecological impact studies.

Why the others are wrong:

• A: Medicine-producing crops target health benefits without altering farming chemicals or land use to harm biodiversity.
• B: Higher-yield crops increase food output but do not inherently promote practices like excessive pesticides that reduce diversity.
• C: Drought-tolerant crops conserve water and reduce irrigation needs, potentially preserving habitats rather than degrading them.

Final answer: D