Final answer:
The exception in the given pairings is 'population; cell,' because a cell is the basic unit of life, not a collection of individuals which a population is. The other pairings are correctly associated within the levels of biological organization.
Step-by-step explanation:
One of the following is not a part of its paired term. Choose the exception: 3) population; cell. The other pairs, atom; organism (1), community; ecosystem (2), molecule; biosphere (4), and species; community (5) correspond correctly to one another within biological organization.
A species is a group of individuals that are genetically related and can breed to produce fertile offspring. A population is all the members of one species that live in the same area and interact with one another. On the other hand, a community consists of all populations of different species living and interacting in the same area.
The exception here is 'population; cell,' because a cell is a basic unit of life, while a population is a group of organisms of the same species inhabiting a specific area. This choice does not fit the pattern of the increasing organization seen in the other pairs where one term is a component of the biological hierarchy, and the other term represents a larger organization that includes the first term.