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The Human Footprint
Chapter 17, Problem 12

Most of the nutrients available for plant growth in an ecosystem are                   . a. deposited in rain; b. made available through the recycling of decomposers; c. maintained within that ecosystem over time; d. B and C are correct; e. A, B, and C are correct

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Nutrient Cycling

Nutrient cycling refers to the movement and exchange of organic and inorganic matter back into the production of living matter. In ecosystems, decomposers play a crucial role in breaking down dead organic material, releasing nutrients back into the soil, which are then available for plant uptake. This process is essential for maintaining soil fertility and supporting plant growth.
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Ecosystem Dynamics

Ecosystem dynamics involves the interactions between living organisms and their physical environment, including the flow of energy and the cycling of nutrients. These dynamics help maintain the balance of ecosystems over time, ensuring that nutrients are recycled and available for various organisms, including plants. Understanding these interactions is key to grasping how ecosystems function sustainably.
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Nutrient Availability

Nutrient availability in an ecosystem is determined by several factors, including the presence of decomposers, soil composition, and climatic conditions. Nutrients such as nitrogen, phosphorus, and potassium are vital for plant growth and are often replenished through natural processes like decomposition and weathering. Recognizing how these nutrients are sourced and cycled is essential for understanding plant nutrition and ecosystem health.
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