Biology

The correct answer is:

C.Bacteria in the soil and lightning in the atmosphere 'fix' the nitrogen.

Explanation:

Nitrogen fixation is the process of converting atmospheric nitrogen (N₂) into a form that plants can use, such as ammonia (NH₃) or nitrates (NO₃⁻). This process is carried out by specific bacteria in the soil and by lightning in the atmosphere.

Here’s why the other options are not correct:

A."Animals eat the plants and other animals that contain nitrogen and release it through their waste" – This describes the nitrogen cycle but not nitrogen fixation. While animals consume plants (which contain nitrogen) and excrete nitrogen in their waste (e.g., as ammonia, urea, or uric acid), this is a process of nitrogen recycling, not nitrogen fixation.

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