Answer:
Option (3).
Explanation:
Law of conservation of matter states that matter can neither be created nor be destroyed in the universe. The matter changes only from one form to the another.
Nitrogen is an element that present in the environment and also makes the composition of the body. The nitrogen cycle in nature maintains the level of nitrogen. In the nitrogen cycle, the total amount of the nitrogen remains the same but it changes its form. This illustrates the law of conservation of matter.
Thus, the correct answer is option (3).
