In many climates, spring follows winter, summer follows spring, fall follows summer, and winter follows fall. this is an example of
a cycle
equilibrium
a model
ethics

one comes through sex and the other does not lul im not

it is called the mitotic spindle

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.

the answer is definitely a