Air passes from the trachea into the lungs through two large tubes called : Bronchi
Bronchi has the function to conducts air to the lungs (it somehow acts as an airway to the respiratory system)
hope this helps
It's answer d, but for info :
The question of wether or not a virus is alive is not resolved, some scientists say yes, some say no.
The fact is, viruses need another organism's enzymatic machinery to survive : alone, they cannot multiply or grow, produce or use energy, functions that are common to everything alive.
On the other hand, they do possess nucleic acids and proteins like living beings!
<span>Term describes hormones that influence the secretion of other hormones is called tropic.
In endocrine system, an example of an organ which makes tropic hormone is anterior pituitary gland. It can produce thyroid stimulating hormone which will cause the thyroid to produce another hormone.</span>
