1) Habitat is a natural environment or a place where an organism or a group of organisms lives together.
2) A niche is a role that species play which includes habitats with different constituents such as type of food they eat, where they reproduce and their relationships with other species.
3)An Ecological niche has specific characteristics, such as availability of nutrients, temperature, terrain, sunlight which tells how well a species survives and reproduces.
4) The ecological niche describes the role, an organism plays in the environment which consists of the species habitat, the organism's activity (the period of time they active) and the resources they obtain from the environment.
So, the correct answer is 'Niche'