Which of the following compete for space on intertidal rocks?

A. algae, mussels, and whelk

B. algae and mussels

C. whelk and chiton

D. starfish only

The answer is B. algae and mussels

The space on intertidal rocks is located between the high and the low tide lines. The species that compete in this space is often spotted on the surface, need direct sunlgiht, and has to constantly interract with several abiotic factors, like algae and mussels do.

B. algae and mussels