A student performs a diffusion lab using a starch/glucose solution, iodine solution, and dialysis tubing (cell membrane). The student waits 10 minutes before making observations. The student reports that iodine moved across the cell membrane. What observation helped the student draw their conclusion?

Diffusion takes place in this process where iodine and glucose molecule diffuses through the dialysis tubing whereas the starch did not. Diffusion takes place on the basis of the size of the molecules.

Starch molecules are large in size whereas iodine and glucose are much smaller therefore they are able to diffuse. If both iodine and starch would have diffuses through the tubing the color would change into dark purple by mixing thee both molecules.

The statement above is TRUE.
The atmospheric cooling that occur where and when aerosol pollution is the greatest  is called aerosol effect. Aerosol effect is an example of negative feed back mechanism. A mechanism is described as negative if it reduces variation in either direction. Examples of aerosol are salt crystals and pollen from windblown seawater and soot and sulfates from coal burning. Aerosols can have strong effects on both heating and cooling of the atmosphere. For instance, accumulation of soot in the atmosphere can cause heating. Some aerosols block out the heat of the sun thus causing cooling.