AP BIOLOGY

Detailed explanation-1: -Locations where elements are stored for long periods of time are called reservoirs. Coal is a reservoir for carbon, and coal deposits can house carbon for thousands of years. The atmosphere is considered a reservoir for nitrogen.

Detailed explanation-2: -Atmosphere is the reservoir of carbon and nitrogen. Hence, these cycles are also called atmospheric cycles. Water is the reservoir of hydrogen and oxygen. Hence, these cycles are called as hydrological cycles.

Detailed explanation-3: -Most of Earth’s carbon is stored in rocks and sediments. The rest is located in the ocean, atmosphere, and in living organisms. These are the reservoirs through which carbon cycles.

Detailed explanation-4: -Unlike carbon, which is stored primarily in sedimentary rock, most nitrogen occurs in the atmosphere as an inorganic compound (N2). It is the predominant atmospheric gas, making up about 79 percent of the volume of the atmosphere.

Detailed explanation-5: -The largest reservoir of nitrogen is found in the atmosphere, mostly as nitrogen gas (N2). Nitrogen gas makes up 78% of the air we breathe. Most nitrogen enters ecosystems via certain kinds of bacteria in soil and plant roots that convert nitrogen gas into ammonia (NH3).