Which cartilage of the larynx forms the "Adam's apple" in humans?

Small hair-like structures line the upper part of the human respiratory tract. These structures trap the dust particles, germs, and chemicals entering the human body during breathing. Smoking is likely to cause infections in the respiratory tract. Which statement best explains this fact?
$A$. Smoking destroys the hair-like structures.
$B$. Smoking causes excessive growth of the hair-like structures.
$C$. Smoking stimulates the hair-like structures to release harmful chemicals.
$D$. Smoking makes the hair-like structures wet and they fail to trap dust particles.

Which structure is primarily responsible for initiating the process of inspiration and expiration of air in humans?

What is the primary function of the respiratory system in humans?

Describe the process of respiration in $Amoeba$. State whether it is anaerobic respiration or aerobic respiration.

The correct sequence of anaerobic reactions in yeast is: