How Does Phosphorus Normally Enter Ecosystems

Question

How does phosphorus normally enter ecosystems?
A) cellular respiration
B) photosynthesis
C) rock weathering
D) vulcanism
E) atmospheric phosphorous gas

Accepted Answer

Phosphorus normally enters ecosystems through rock weathering. As rocks weather, phosphate ions are released into the soil and water.

Note: Option E is not a valid option as phosphorus does not exist as a gas in the atmosphere.