D because trachea is the tube, bronchi is what splits into your lungs, bronchioles are what look like branches of the bronchi, and alveoli are the little air bags at the bottom of the smallest bronchioles.
Organ system..................
Im not entirely sure but i think the best answers are planning ahead, being willing to fail, developing strategies, and determining outcomes
In human exchange of gases takes place in alveoli in lungs
In plants it occurs in leaves through stomata
In fishes it occurs through gills
