Two dominant organisms commonly found at mid-water levels of the rocky intertidal zone are:
A) buckshot barnacle and rockweed.
B) fiddler crab and Littorina.
C) goose barnacle and mussel.
D) periwinkle snail and kelp.
E) sea anemone and hermit crab.

Question

Quizplus · Accepted Answer

The question specifies mid-water levels of the rocky intertidal zone, which is where organisms that can tolerate some exposure to air and crashing waves are found. While some of the other organisms listed may also be found in this zone, choices A and D are primarily subtidal, choice B is typically found in the upper intertidal zone, and choice E is often associated with tide pools. In contrast, goose barnacles and mussels are commonly found at mid-water levels of the rocky intertidal zone, where they attach themselves to rocks and other hard surfaces in order to filter feed.

Two Dominant Organisms Commonly Found at Mid-Water Levels of the Rocky