The most likely exponential growth is The mold growing in a moist bathroom that is never cleaned
Explanation:
Exponential growth happens due to increase in number as well as in size of individual per unit time. Exponential growth also seen to be supporting the reproduction cycle and larger pool of individuals for the coming cycle. It is also being affected with the availability of food and predation, these two factor can become threat to mold growth. The food availability is ought to be limiting factor for growth of mold. Here, the growth of molds in moist condition as well as when the bathroom is never cleaned, it simply means the ample amount of food availability for growth of molds. Therefore this example supports the exponential growth.
Phosphate would be the limiting factor, so the answer would be B. The experiment shows that the algae is only growing if phosphate is present and when it's absent the algae does not grow. Which means that phosphate is an important variable that will determine algae growth.
