Answer and Explanation:
Organism
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Population
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Biological community
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Ecosystem
Ecosystem is a natural self-sustaining ecological unit in which the different types of habitats and their flora and fauna interact and influence one another. e.g., forest, grassland,lake
Biological community includes all the species-flora and fauna- that exist and interact in a habitat. For instance, the community in a montane forest includes all the animal species of mammals, reptiles, birds
Population is the total number of individuals of a particular species found in a habitat at a particular time.
Organism is any living thing in an ecosystem that has an organized structure, can respond to stimuli, reproduce, grow and develop.
