Final answer:
The classification of organisms according to species interactions includes pathogenesis, parasitism, commensalism, and mutualism.
Step-by-step explanation:
In the classification of organisms, species interactions can be categorized into different types based on their consequences. Disease can be classified as pathogenesis, parasitism, commensalism, or mutualism. Pathogenesis refers to interactions where the pathogen causes disease and harm to the host. Parasitism is a symbiotic relationship in which one member benefits at the expense of the other. Commensalism occurs when one member benefits without affecting the other. Mutualism is a symbiotic relationship where both organisms benefit.