How do intra-specific and inter-specific relationships within a community maintain biodiversity by preventing competitive exclusion?

One species will often exhibit an advantage in resource use. This superior competitor will out-compete the other with more efficient use of the limiting resource. As a result, the inferior competitor will suffer a decline in population over time. It will be excluded from the area and replaced by the superior competitor. Without it and having intra-specific and inter-specific relationships in a community will lead to a harmonious community and maintain the biodiversity.