Question

which of the following statements about the phosphorus cycle are correct? phosphorus is present in land based ecosystems but rarely in aquatic ecosystems phosphorus is released into the atmosphere by volcanic eruptions phosphorus is rarely a limiting factor in an ecosystem phosphorus mainly enters the biosphere from rock and sediments

Explanation:

Phosphorus is present in both land - based and aquatic ecosystems. It is not commonly released into the atmosphere by volcanic eruptions as it is a non - gaseous nutrient under normal conditions. Phosphorus can be a limiting factor in ecosystems. Phosphorus mainly enters the biosphere from rock and sediments through weathering and erosion.

Answer:

Phosphorus mainly enters the biosphere from rock and sediments