The routes air and food into their proper channels and plays a role in speech.

Larynx

Explanation:

The Larynx is an organ of the body located at the anterior of the neck. It is also called the glottis or the voice box. The larynx is the air passageway or structure that connects to the trachea, it directs air into the lung and hence aids breathing. This organ is responsible for sound production, breathing and helps to prevent pulmonary aspiration. The larynx comprises of the vocal folds which plays an important role in speech and singing; in making of sounds the larynx muscle regulate the tension and the length of the vocal folds in order to tune the tone and the voice pitches.

Larynx

Explanation:

Larynx is also called voice box.

It is an organ that is in tube like shape which is long and about 2.5cm. it is located above the wind pipe or trachea in the neck and food pipe. It houses the vocal folds and manipulate pitch and volume.

It is responsible for breathing, it route air and food in proper direction and protect the trachea against food aspiration.

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.