Which of the following best explains why soil conservation is important to human agriculture?

Soil forms very slowly, so replacing soil that has been degraded or lost can take a long time. Preventing degradation helps preserve the soil agriculture already depends on, making choice b, “It is easier to prevent the degradation of old soil than it is to generate new soil,” the best explanation. The other choices describe specific problems that conservation may help address, but not the broader reason it is important.

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