Answer:
Without fertilizers, nature struggles to replenish the nutrients in the soil. When crops are harvested, important nutrients are removed from the soil, because they follow the crop and end up at the dinner table. If the soil is not replenished with nutrients through fertilizing, crop yields will deteriorate over time.
Explanation:
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Answer: The nervous system as a whole is divided into two subdivisions: the central nervous system (CNS) and the peripheral nervous system (PNS).
Explanation:
Answer:
The bones of the skeletal system protect the body's internal organs, support the weight of the body, and serve as the main storage system for calcium and phosphorus. The muscles of the muscular system keep bones in place; they assist with movement by contracting and pulling on the bones.
Explanation:
The answer is letter a. Being subjected to immense heat and the experience of pressure due to being far below the Earth's surface can change igneous or sedimentary rocks to metamorphic rocks.
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