The sun shining on a tidal pool during a hot day heats the water. As some water evaporates, the pool becomes saltier, causing ________.
A) an increase in its carbon dioxide content
B) a decrease in its oxygen content
C) an increase in its ability to sustain aerobic organisms
D) a decrease in the water's density

Question

Quizplus · Accepted Answer

As the water in the tidal pool heats up, it becomes saltier due to evaporation of some water. As the salinity increases, the oxygen content of the water decreases, making it difficult for aerobic organisms to survive. This is because saltier water is denser, and dense water sinks, taking oxygen with it to the bottom of the tidal pool. As a result, the top layers of the water are depleted of oxygen.

The Sun Shining on a Tidal Pool During a Hot