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.
About PTC PTC (NASDAQ: PTC) is a global software company that delivers a technology platform and solutions to help companies design, manufacture, operate, and service things for a smart, connected world.
The PTC Product Development System, which is comprised of the powerful combination of Windchill PDMLink, Windchill ProjectLink and Pro/ENGINEER, facilitates better collaborative design, global product development, configuration management and lifecycle support in fast moving sectors driven by ongoing innovation to stay competitive and dramatically ...