A search on the word Classification - I hope you find this as interesting as I did "man who is wise"--Homo is our genus and sapiens is our species Estimates of the total number of living species generally range from 10 to 100 million. It is likely the actual number is on the order of 13 to 14 million, with most being insects and microscopic life forms in tropical regions. However, we may never know how many there are because many of them will become extinct before being counted and described. The highest category in the Linnaean system of classification is the kingdom. At this level, organisms are distinguished on the basis of cellular organization and methods of nutrition. Whether they are single- or multiple-celled and whether they absorb, ingest, or produce food are critical factors. Immediately below kingdom is the phylum click this icon to hear the preceding term pronounced level of classification. At this level, animals are grouped together based on similarities in basic body plan or organization. For instance, species in the phylum Arthropoda click this icon to hear the preceding term pronounced have external skeletons as well as jointed bodies and limbs. Insects, spiders, centipedes, lobsters, and crabs are all arthropods. Kingdom: Animalia You think life is only plants and animals - think again Monera small, simple single prokaryotic cell (nucleus is not enclosed by a membrane); some form chains or mats absorb food bacteria, blue-green algae, and spirochetes 4,000 1,000,000 |
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