Which structure has functions in both the respiratory system and the digestive system? esophagus larynx pharynx lung

The correct answer would be pharynx as it has functions in both the respiratory system and the digestive system.

Explanation:

The pharynx is commonly known as the throat. It is part of both the digestive system and the respiratory system. The pharynx extends from the mouth and the nasal cavity to the esophagus and the larynx.

In the digestive system, the muscular walls of pharynx involve in swallowing and it serves as the pathway for food to the esophagus.

In the respiratory system, the pharynx role is to allow inhaled air which enters the nasal cavity to makes its way to the respiratory tract.

Thus, the correct option would be pharynx.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.