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There are six levels of ecological organization, listed from the smallest to the largest, they are: organism, population, community, ecosystem, biome and biosphere.
The two levels which are made up of members of only a single species are ORGANISMS and POPULATION. Organism refers to any individual living thing while population refers to a group of individual species that live in a specific area at a particular time.

Answer: Your answer is B Organisms and Population  Organism refers to any kind of  individual living thing while population refers to a kind of group of individual species that live in a specific area at a particular time.

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