Answer:
they are important because if you did not know what boiling point is on water or freezing point is then it would be pointless in trying to make ice or boil water for food
Explanation:
The barnacles are only able to attach them selfs to surfaces in the water. Since the surface is limited, barnacles are attaching themselves to the other barnacles, crowding the rock. The muscles were not able to grow or attach themselves off the surface of the rock. Same thing with the mussels that are growing on the rock. So not only barnacles are crowding the rock, but Mussels as well are crowding the rock.
The answer to this one is true
