annuals - plants that grow, produce seeds, and die within one year, biennials - plants that live and reproduce in two years, conservation tillage - occurs when farmers leave 30% of an agricultural area covered with crop residue after harvesting the crop, crop rotation - the practice of growing different types of crops in the same field each year, high-resource environment - environments where nutrients, light, and water are readily available and temperatures and the length of the growing season are sufficient for most annual crops to complete their life cycle, low-resource environment - environments where nutrients, light, and/or water are not readily available, perennials - plants that live for three or more years, vegetative reproduction - when storage organs produce root and shoot buds that can grow into independent offspring, erosion - the loss of soil by wind or water that can be prevented by growing perennials,

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