Final answer:
In secondary succession, biotic interactions such as competition, predation, and mutualism occur.
Step-by-step explanation:
In secondary succession, there are various biotic interactions that occur as the community is reestablished after a disturbance. One common interaction is competition among plant species for available resources, such as sunlight, water, and nutrients. Another interaction is predation, where animals feed on other organisms, regulating their populations. Additionally, mutualism can occur between certain plant and animal species, where both benefit from the interaction.