childproof (ËtÊaÉªldpruËf) or child proof adj designed to eliminate or minimize hazards to children. childâ²proof` or childâ²-proof`, adj. 1. incapable of being opened, tampered with, or operated by a child. 2. made free of hazard for a child.
In biology, a kingdom is the top-level, or nearly the top-level, grouping of organisms in scientific classification. Originally, two kingdoms were distinguished, the Animalia (animals), which typically could move about, and the Plantae (plants), which typically could not.
Historically, kingdom is the highest taxonomic rank, or the most general taxon used in classifying organisms. However, in the new three-domain system introduced by Carl Woese in 1990, the domain is the most general taxon, and kingdom is only next. The five-kingdom taxonomic classification of the world's biota into Kingdom Animalia, Plantae, Fungi, Protista, and Monera as proposed by Robert Whittaker in 1969 has become a popular standard of classifying organisms.