Question

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What is a major difference between the nitrogen and phosphorus cycles?

O A. Animals excrete only phosphorus-containing compounds to add to the cycle.

O B. Soil erosion removes only phosphorus from its cycle in terrestrial ecosystems.

O C. Only nitrogen is added to its cycle from fertilizers.

OD. Only nitrogen exists as a gas for part of the cycle.

Answer 1

D

Step-by-step explanation:

phosphorus is usually not shown in gas form