Select the correct answer from each drop-down menu. Complete the passage about the nitrogen cycle.

During nitrogen fixation, specialized bacteria living in Earth’s convert nitrogen taken from the into ammonia. Another set of bacteria convert the ammonia to compounds called nitrates that plants and animals can use.

1. A. cryosphere, B. geosphere, C. atmosphere
2. A. hydrosphere, B. atmosphere, C. geosphere

15 ! come and answer! a(n) is the general term for an infectious disease that has spread across a city, region, or country.

Cpr, or cardiopulmonary resuscitation, is a first-aid technique to save lives. it involves compressions of the patient's chest cavity. which description is the best description of the functions of chest compressions in cpr? chest compressions are done to pump the heart. chest compressions are done to strengthen the rib bones. chest compressions increase carbon dioxide inhalation. chest compressions allow the patient's muscles to wake up.

What chemical speeds up the process of decomposition in dead organisms are exposed to it? nitrogen oxygen hydrogen chlorine