The ecological niche of an organism refers to its specific role or position within an ecosystem. It encompasses not only the physical environment in which the organism lives (its habitat), but also its interactions and relationships with other organisms in the ecosystem. Option 1 correctly states that the ecological niche is related to the specific habitat of the organism. This means that the niche includes the resources and conditions provided by the habitat that the organism depends on for survival, such as food, shelter, and climate. However, it is important to note that the ecological niche is not limited to just the habitat. It also includes the organism`s interactions with other species, such as its predator-prey relationships, competition for resources, and symbiotic partnerships. Therefore, option 2 is not a comprehensive answer since it only mentions symbiotic relationships and not the entire scope of interactions. Option 3 is also incorrect as it only focuses on the occurrence of a species under different conditions without mentioning the role of interactions. Option 4 is too broad, as it implies that the ecological niche solely relates to an organism`s interaction with all other organisms, rather than also including the specific habitat.