What are the two boundaries of the intertidal zone?

Along most shores, the intertidal zone can be clearly separated into the following subzones: high tide zone, middle tide zone, and low tide zone. In the intertidal zone the most common organisms are small and most are relatively uncomplicated organisms.

Explanation:

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.