Question

nitrogen cycle: nitrogen fixation, nitrification, lightning, nitrifying bacteria, nitrogen fixing bacteria, decomposers, plants, nitrates, nitrites

Explanation:

Since no specific question is provided about the Nitrogen Cycle content (like explaining a term, listing steps, etc.), it's hard to give a targeted answer. If you want to know about a specific aspect, for example, "Explain the role of nitrogen - fixing bacteria in the nitrogen cycle", here is the answer - explanation format:

Nitrogen - fixing bacteria (e.g., Rhizobium in root nodules of legumes) convert atmospheric nitrogen ($N_2$) into ammonia ($NH_3$) or other nitrogen - containing compounds that plants can use. This process is called nitrogen fixation, and it is an important step in the nitrogen cycle as atmospheric nitrogen is not directly usable by most plants, and these bacteria make nitrogen available for plant uptake, which then enters the food chain when plants are consumed by other organisms.

Answer:

Nitrogen - fixing bacteria convert atmospheric $N_2$ to plant - usable nitrogen compounds via nitrogen fixation, facilitating nitrogen entry into the food chain.

If your question is different (like listing the steps of the nitrogen cycle, explaining nitrification, etc.), please clarify the question so that a more accurate answer can be provided.