Some carbon dioxide released by human activity dissolves in the oceans and increases ocean acidity. Corals are very sensitive to changes in pH. A scientist wants to study the effect of increasing ocean acidity on coral reef structure and survival.
Answer
A
limitation due to time needed to do the experiment
B
limitation due to the system being too large or small
C
limitation due to cost or equipment for the experiment
D
limitation due to ethical concerns about experimental subjects