Question

The diagram shows a simplified nitrogen cycle. Which process is responsible for returning nitrogen to the air?

Nitrification

Excretion

Photosynthesis

Decomposition

Answer 1

The process responsible for returning nitrogen to the air in the nitrogen cycle is **Decomposition**. During decomposition, organic matter is broken down by microbes, which can release nitrogen in the form of gases back into the atmosphere. This process contributes to the natural recycling of nitrogen within ecosystems.