Discussion
Seaweeds, mussels, barnacles and lichens typically indicate :
Answer: A
This community indicates a rocky inter-tidal environment.
Seaweeds, mussels and barnacles all need a hard surface to attach to and tolerate being exposed at low tide; they form the classic zones of a rocky shore. Lichens such as the black Verrucaria mark the splash zone at the top of the same shore.
A soft-bottom (sandy or muddy) intertidal flat has no stable surface for attached organisms, so its fauna is burrowers such as worms and clams. A coral reef is dominated by corals, and the continental slope lies in deep water, below the depth where seaweeds can photosynthesise and far from any lichen.
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