The biological association that contributes directly to succession in a community is:

Explanation

In a community, there is a process called succession where different species replace each other over time. The question is asking about the biological association that directly contributes to this process. The options given are competition, predation, parasitism, and commensalism. Competition is the interaction between organisms that need the same resources, such as food, water, and shelter. This can lead to one organism outcompeting the other, which can indirectly affect succession by reducing the population of one species. Predation is when one organism (the predator) kills and eats another organism (the prey). This can also indirectly affect succession by reducing the population of one species and allowing other species to take its place. Parasitism is when one organism (the parasite) lives on or inside another organism (the host) and benefits at the expense of the host. This can directly affect succession by weakening the host and making it more vulnerable to other species. Commensalism is a relationship where one organism benefits and the other organism is not affected. This relationship does not contribute directly to succession. Therefore, the correct answer is competition because it directly affects the success of one species over another in the community by limiting their resources.