Question

In the paragraph below, select the words that correctly complete the sentences that describe the nitrogen cycle.

Answer 1

Answer:

According to the law of conservation of mass, there is a fixed amount of nitrogen on Earth. Nitrogen that exists in the air is fixed by nitrogen fixing bacteria in root nodules. This allows it to exist in the soil. Plants then use the nitrogen to make proteins and other complex compounds. When animals eat the plants, the nitrogen is then transferred to their bodies. When these organisms die, the nitrogen is broken down by decomposers and returned to the air by bacteria.