What is it called when organisms fight for limited resources?

When organisms fight for limited resources, it is called "intraspecific competition" if it occurs between members of the same species, or "interspecific competition" if it occurs between different species. This competition can involve various resources such as food, water, territory, or mates, and it plays a crucial role in natural selection and ecosystem dynamics. Over time, it can lead to adaptations that help species coexist or thrive despite the competition.