Which condition is essential for natural selection to result in a new species?
a. a static environment
b. a long life span
c. unlimited resources
d. an inherited variation

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.

answer; (a) medicalized;