biology 9학년 문제 하나만 도와줘...ㅠㅜ (ecology)

what does it mean that a nutrient can be a limiting factor in an ecosystem?

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=How does nutrient availability relate to the primary productivity of an ecosystem?

Ecologists are often interested in an ecosystem's primary productivity--the rate at which primary producers create organic material.
=If ample sumlight and water are available, the primary productivity of an ecosystem may be limited by the availability of nutrients.
If even a single essential nutrient is in short supply, primary productivity will be limited.
The nutrient whose supply limits productivity is called the limiting nutrient.

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Because nutrients can limit the primary productivity of an ecosystem, the rate at which primary producers create organic materials, they can be a limiting factor in an ecosystem 그냥 간단하게 이거 아냐?