Science Hirap Sir

Makes up approximately 78precent and 21percent of the atmosphere

Filtered through the two openings of the nose called the

Common passageway for both food and air

leads to the digestive system

is a flap of tissue that closes

located at the top of the trachea is the

n the larynx are two elastic ligaments called

two of the pieces are connected by a ridge and is called

Tube-like structure is called

the main organs of the respiratory system