A student builds a model to show how pollutants move through an ecosystem. In plastic tub, the student places a layer of small marbles and covers it with a thick cloth and adds a layer of sand. The student sprinkles red powdered paint on top of the soil. When the student sprays water onto the model, red color appears in the cloth and in the water in the layer of marbles. Which part of the model represents pollutants introduced by humans

explanation:

yes you are doing it right great gob

is this a psat question, if so do not cheat try your best.

answer;

c. a tree whose roots are surrounded by wet sand.

explanation;

water stress is an important factor limiting the growth and productivity of forests.water stress is the most often cited cause of poor survival and growth of woody landscape plants.

-insufficient soil moisture is the most common form of water stress, but excess moisture that leads to poor soil aeration (hypoxia) can also result in reduced plant vitality. a tree whose roots are surrounded by wet sand would be least likely to experience water stress.

garbage disposal because lysosomes dispose of old cell parts like garbage disposals dispose of old food.