Connell studied the distribution of barnacles Chthamalus stellatus and Balanus balaoides along the coast of Scotland and indicated that, along with the physiology of each barnacle, also played a large role in their distribution pattern.

Competition.

Explanation:

The interaction between the organisms can be beneficial harmful or neutral depending on the types of organisms. Different types of interaction are mutualism, ammensalism and commensalism.

The competition occurs when the individual compete for the same resources or for the habitat. The competition results in the exclusion of one species and determines the distribution of other species.

Thus, the answer is competition.

i am going to guess that it is co2.

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