Which of the following is NOT a common organism in the high-tide zone?

The high-tide zone, or supralittoral zone, is characterized by its exposure to air during low tide and limited submersion in seawater, making it a challenging environment for organisms. The organisms that thrive in this zone typically have adaptations that allow them to withstand desiccation and significant fluctuations in salinity and temperature.

Isopods, barnacles, and crabs are all commonly found in the high-tide zone. Isopods, which are small crustaceans, are often found in intertidal zones where they can find shelter in crevices during low tide. Barnacles are also well-adapted to this environment, as they can firmly attach themselves to rocks and other hard surfaces, making them resistant to wave action and desiccation. Crabs, particularly those that can burrow or seek shelter, also populate this area, taking advantage of the organisms that inhabit or wash into this zone.

In contrast, sea urchins are typically associated with the subtidal and lower intertidal zones, where they can find ample food sources, such as algae on rocky substrates. They are less adapted to the extreme conditions found in the high-tide zone, where they would be more exposed and vulnerable to