In medicine, there are four levels of care: primary, secondary, tertiary, and quaternary. The levels of care refer to the complexity of the medical cases that healthcare providers treat and the skills ...
An industry is any economic activity which creates jobs and generates income. There are four main types of industry: primary, secondary, tertiary and quaternary. The type of industry a country ...
Gordon Scott has been an active investor and technical analyst or 20+ years. He is a Chartered Market Technician (CMT). Katrina Ávila Munichiello is an experienced editor, writer, fact-checker, and ...
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