Final answer:
Herbicides, also called weedkillers, are substances that control unwanted plants. They can be selective or non-selective and affect plant biology.
Explanation:
Herbicides, also known as weedkillers, are substances used to control unwanted plants. They can be selective or non-selective based on their target. Herbicides work by affecting the physiology, biochemistry, and development of plants, either at the site of application (contact) or by moving within the plant (systemic).
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