Final answer:
In the context of rainy conditions, if two species compete over the same resources, such as food and nesting space, the competition might lead to competitive exclusion, where one species predominates and the other either migrates or dies off.
Step-by-step explanation:
The question appears to be asking about the effects of interspecific competition on two species during rainy conditions. Interspecific competition occurs when two or more species in the same ecosystem compete for shared resources such as food, space, or mates which can affect both species. Considering the given scenarios ('c' and 'd'), it seems that these species have overlapping needs and may compete for food and nesting space during rainy conditions.
If the competition is severe, one species may outcompete the other, leading to the latter species migrating to another region or dying off. This is an example of competitive exclusion, where one species outcompetes another in a shared ecological niche, resulting in the decline or elimination of the less competitive species.