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Haeckel's original (1866) conception of the three kingdoms of life, including the new kingdom Protista. Notice the inclusion of the cyanobacterium Nostoc with plants. In 1674, Antonie van Leeuwenhoek , often called the "father of microscopy", sent the Royal Society of London a copy of his first observations of microscopic single-celled organisms.
1938 [5] [6] Whittaker 1969 [7] Woese et al. 1977 [8] [9] Woese et al. 1990 [10] Cavalier-Smith 1993 [11] [12] [13] Cavalier-Smith 1998 [14] [15] [16] Ruggiero et al. 2015 [17] — — 2 empires: 2 empires: 2 empires: 2 empires: 3 domains: 3 superkingdoms 2 empires: 2 superkingdoms: 2 kingdoms 3 kingdoms — 4 kingdoms: 5 kingdoms: 6 kingdoms ...
Linnaeus 1735 [1] Haeckel 1866 [2] Chatton 1925 [3] Copeland 1938 [4] Whittaker 1969 [5] Woese et al. 1990 [6] Cavalier-Smith 1998, [7] 2015 [8] 2 kingdoms 3 kingdoms 2 empires: 4 kingdoms: 5 kingdoms
Since then, various life forms have been moved into three new kingdoms: Monera, for prokaryotes (i.e., bacteria); Protista, for protozoans and most algae; and Fungi. This five-kingdom scheme is still far from the phylogenetic ideal and has largely been supplanted in modern taxonomic work by a division into three domains: Bacteria and Archaea ...
A life form (also spelled life-form or lifeform) is an entity that is living, [1] [2] such as plants , animals , and fungi . It is estimated that more than 99% of all species that ever existed on Earth, amounting to over five billion species, [3] are extinct. [4] [5] Earth is the only celestial body known to harbor life forms. No form of ...
By 1998, Cavalier-Smith had reduced the total number of kingdoms from eight to six: Animalia, Protozoa, Fungi, Plantae (including red and green algae), Chromista, and Bacteria. [44] Five of Cavalier-Smith's kingdoms are classified as eukaryotes as shown in the following scheme: Eubacteria; Neomura. Archaebacteria; Eukaryotes. Kingdom Protozoa
Life is divided into domains, which are subdivided into further groups. Intermediate minor rankings are not shown. Intermediate minor rankings are not shown. In biological taxonomy , a domain ( / d ə ˈ m eɪ n / or / d oʊ ˈ m eɪ n / ) ( Latin : regio [ 1 ] ), also dominion , [ 2 ] superkingdom , realm , or empire , is the highest taxonomic ...
Partial classifications exist for many individual groups of organisms and are revised and replaced as new information becomes available; however, comprehensive, published treatments of most or all life are rarer; recent examples are that of Adl et al., 2012 and 2019, [81] [82] which covers eukaryotes only with an emphasis on protists, and ...
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