What is the sequence of species diversity among different groups of plants and vertebrates
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Answer:
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Explanation:
The total number of species living on the planet is imprecisely known and published estimates vary from 12 million to over 100 million. This is because there are large numbers of species yet undiscovered and undescribed, and there is not always agreement on whether certain organisms should be regarded as separate species. The total number of known species including all animals, plants and micro-organisms is about 1.4 million, and over half of these are insects! Taxonomists have fairly complete records for the best known groups (e.g. birds with 9, 881 species world-wide). It is now also reasonably clear where the main gaps in our knowledge are, and intensive sampling of species-rich groups (e.g. insects) and species-rich areas (e.g. moist tropical forests) is now taking place to provide a more reliable picture of global and regional species richness, and a stronger basis for estimating the number of species.
In order to study the enormous diversity of organisms they need to be organised into manageable groups. This grouping of organisms is known as classification and the study of biological classification is called taxonomy. The usual method of classifying organisms, although not the only one in existence, follows the system originally proposed by the Swedish naturalist Carl Linnaeus (1707-1778) who gave each organism a two-part scientific name - a genus name and the species name (e.g. Homo sapiens). It is a hierarchical system of groupings based on evolutionary relationships. The sequence in the hierarchy is as follows: Kingdom-Phylum-Class-Order-Family-Genus-Species.