Awildlife researcher weighed all the raccoons that were trapped in suburban neighborhoods before they were released back into the wild. the researcher used this data to conclude that the raccoons in the state were getting heavier.

The sample is biased because it weighed only raccoons trapped in neighborhoods in suburban areas.

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.