The photograph shows a consequence of air pollution. What does the photograph represent?

A. Pollutants break down the layer of ozone in the stratosphere.

B. Gaseous pollutants and particulate pollution mix over cities.

C. Pollutants react with water and are deposited on Earth's surface.

D. Algae overgrowth occurs in the presence of too many nutrients.

Group control group #1 experimental group yes yes yes control group #2 no new drug orange juice bed rest no yes no yes ves which of the following is the best explanation of why a second control group was included in this experiment? o a. to provide the volunteers in the study with something to drink o b. to prove that the common cold cannot be cured c. to confuse anyone who is trying to steal their new drug and sell it as their own invention o d. to researchers conclude that results are related to the new drug and not to the orange juice submit e previous