The Six Kingdoms. When Linnaeus developed his system of classification, there were only two kingdoms, Plants and Animals. But the use of the microscope led to the discovery of new organisms and the identification of differences in cells.A two-kingdom system was no longer useful.Today the system of classification includes six kingdoms.he Six Kingdoms. When Linnaeus developed his system of classification, there were only two kingdoms, Plants and Animals. But the use of the microscope led to the discovery of new organisms and the identification of differences in cells.
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DEFINITION of 'Protected Cell Company (PCC)'. A corporate structure in which a single legal entity is comprised of a core and several cells that have separate assets and liabilities.The protected cell company, or PCC, has a similar design to a hub and spoke, with the central core organization linked to individual cells.Each cell is independent of each other and of the companyâs core, but the entire unit is still a single legal entity. Next Up.he protected cell company, or PCC, has a similar design to a hub and spoke, with the central core organization linked to individual cells.