How Does the Nutrient Cycle of Aquatic Systems Differ from That

How does the nutrient cycle of aquatic systems differ from that of terrestrial systems?

A) Inputs of nutrients from outside the ecosystems are more important in aquatic ecosystems.
B) Nitrogen cycles are less important in aquatic ecosystems.
C) Aquatic ecosystems are not dependent on decomposition.
D) Chemical weathering does not contribute to nutrient supply in aquatic ecosystems.