AP BIOLOGY

Detailed explanation-1: -Lightning is the main natural source of abiotic factor that contributes the atmospheric nitrogen fixation. The massive energy of lightning split nitrogen molecules and facilitates the atoms to unite with oxygen in the air to form nitrogen oxides.

Detailed explanation-2: -The largest single source of nitrogen is the atmosphere. It is made up of 78 percent of this colorless, odorless, nontoxic gas.

Detailed explanation-3: -The atmosphere, water, and soil represent the abiotic locations. Nutrients are also stored in sediments, rocks, and oceans.

Detailed explanation-4: -Nitrogen Cycle is a biogeochemical process through which nitrogen is converted into many forms, consecutively passing from the atmosphere to the soil to organism and back into the atmosphere. It involves several processes such as nitrogen fixation, nitrification, denitrification, decay and putrefaction.