The correct definition of habitat is option 4: "Natural environment of a living organism and the place where one would go find the particular living organism." Habitat refers to the specific place or environment where a particular organism lives or is found. It includes both the physical surroundings and the biological factors necessary for the organism`s survival. The habitat provides the necessary resources such as food, water, shelter, and suitable conditions for reproduction and growth. It is important to note that habitats can vary in size, from small areas like a rock pool to large ecosystems like a forest. Option 1 is incorrect because a habitat is not a complex of several types of communities, but rather the specific environment where an organism lives. Option 2 is not comprehensive enough as it lacks the mention of the place where the particular organism can be found. Option 3 is also incorrect as it only mentions the place where the organism can be found but does not include the idea of a natural environment.