According to the biological species concept, what should biologists do when two similar organisms that were originally thought to be separate species are found to interbreed freely and produce viable, fertile offspring?

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answer: c.

explanation:

the cell is the smallest structural and functional unit of living organisms, which can exist on its own. therefore, it is sometimes called the building block of life. some organisms, such as bacteria or yeast, are unicellular—consisting only of a single cell—while others, for instance, mammalians, are multicellular.