Chthamalus and Balanus belong to the same trophic level. Based on this information and their distributions in the low tide zone in Connell's experiment, what is the best way to represent the interaction between the two species?

-/- or Competition

Explanation:

The competition is one of the five types of ecological relations where the related organisms compete for the same sources for their livings. Because there are limited resources at each trophic level fitness of one organism is affected due to the competition. In the experiment Connell found that Chthamalus and Balnus exhibit interference  competition. In the low tidal zone the Balnus finds it hard to survive due to Chthamalus where as in deeper zones it survives but Chthamalus fails to survive due to Balnus.

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the answer would be..

b. sucking