Here is figure 1…. 30. Calculating A change in one unit on the pH scale represents a tenfold increase in the
concentration of hydrogen ions. According to the pH values listed in Figure 1, how much greater
is the hydrogen ion concentration in coffee than in carbonated beverages?

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

yes, because even though a theory has a  lot of evidence to support it, it is not always true

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.