What is glottis ?

Assertion. Human lungs have enormous surface area for exchange of gases. Reason. In humans glottis is guarded by epiglottis.

What is magnetism and what is magnet ?

During swallowing of food which of the following structures prevent the entering of food into the glottis ?

During swallowing of food which of the following structures prevent the entering of food into the glottis ?

Why the glottis is guarded by epiglottis ?

What is hypothesis? What are variables?