Which statement best describes a scientific theory? (1) It is a collection of data designed to provide
support for a prediction.
(2) It is an educated guess that can be tested by
experimentation.
(3) It us a scientific fact that no longer requires any
evidence to support it.
(4) It is a general statement that is supported by
many scientific observations.

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.

i think i can answer even without the example. over time with environmental changes, sometimes a group of animals will adapt to better survive. take a moth for example. if the trees the moths use to camouflage themselves from predators, started to die or change colors themselves, the moths may, overtime of course, change color too. its just adapting to its surroundings. hope i was of any : )