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

According to the , there is a fixed amount of nitrogen on Earth. Nitrogen that exists in the air is fixed by in root nodules. This allows it to exist in the soil. 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 and returned to the air by bacteria.

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.

cell regulation is conducted by special proteins.

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.