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B
Species
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C
Individual
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D
Animals
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Solution
The correct option is C Individual Ecological hierarchy theory describes the arrangement of biological organisms in relation to one another. At the simplest level of the hierarchy are individual organisms. At the individual level, interactions with other organisms are not considered. Moving up the hierarchy, ecologists have found more complex ways to describe the relationships between organisms. These culminate in the biosphere, which describes the totality of all living things on planet Earth. The first level of the ecological hierarchy is the individual organism. This level of the hierarchy examines how one organism interacts with its environment.