Elina is working on the causes of the diseases while Dwight is proferring solution of the cure of the disease. though they are working on the same species or properties of the disease but they have different aims and objectives, different scope and different methodology.
Answer: Ecological succession is the process that describes how the structure of a biological community (that is, an interacting group of various species in a desert, forest, grassland, marine environment, and so on) changes over time.