Ecological relationship is very important in our ecosystem. Every part has its own duties in maintaining the natural flow of the ecosystem. If there are part or one that become endangered, there is a possibility that all the remaining parts would be in danger.
Ecological relationship is important because all organism in an ecosystem has its own purpose which benefits other organism within the same ecosystem like the plants their purpose is as a producer since they are autotrophic they made their food using raw materials from the environment ( water, CO2) and they also serve as food for the primary consumers or the herbivores so if there is no relationship in an ecosystem  organisms will cease to survive and it will not be called as a system at all