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Group Number of Living Species Vertebrates 42,000 Mammals 4,000 Birds 9,000 Reptiles 6,000 Amphibians 4,000 Fish 19,000 Invertebrates 980,000 Plants 248,000 insect fish snake bird rabbit tiger polar bear black bear grizzly bear fish snake bird rabbit tiger polar bear black bear grizzly bear rabbit tiger polar bear black bear grizzly bear tiger polar bear black bear grizzly bear polar bear black bear grizzly bear black bear grizzly bear grizzly bear Variety of Life Millions of different living things are found on Earth; and there’s a large number of living things that have not yet been discovered. The different structures and characteristics among organisms make it possible for them to survive and reproduce in every place on Earth. Living organisms are found on every type of land, deep in the oceans and high in Earth’s atmosphere. Known Species on Earth Levels of Classification Biologists classify every organism into seven different levels - kingdom, phylum, class, order, family, genus and species. Each level contains organisms with similar characteristics. The Kingdom is the largest group and the most diverse. Organisms in this group share the least number of characteristics with each other. Notice that as you move to the lower levels of classification, the number of organisms decreases. The species is the smallest group. Organisms in this group share more characteristics with each other. Only organisms within a species are able to mate and produce fertile offspring. This chart traces the classification of a grizzly bear through each of the seven levels of classification. KINGDOM Animalia PHYLUM Chordata CLASS Mammalia ORDER Carnivora FAMILY Ursidae GENUS Ursus SPECIES horribilis Diversity of Life © Copyright NewPath Learning. All Rights Reserved. 94-4601 www.newpathlearning.com
Group Number of Living Species Vertebrates Mammals Birds Reptiles Amphibians Fish Invertebrates Plants insect fish snake bird rabbit tiger polar bear black bear grizzly bear fish snake bird rabbit tiger polar bear black bear grizzly bear rabbit tiger polar bear black bear grizzly bear tiger polar bear black bear grizzly bear polar bear black bear grizzly bear black bear grizzly bear grizzly bear Variety of Life Describe the variety of life on Earth. __________________________________ _________________________________________________________________ _________________________________________________________________ Known Species on Earth Levels of Classification This chart traces the classification of a grizzly bear through each of the seven levels of classification. Biologists classify every organism into seven different levels: 1. _____________________ 2. _____________________ 3. _____________________ 4. _____________________ 5. _____________________ 6. _____________________ 7. _____________________ Key Vocabulary Terms • animalia • genus • carnivora • kingdom • chordata • mammalia • class • order • classification • phylum • family • species Diversity of Life © Copyright N ewPath Learning. All Rights Reserved. 94-4601 www.newpathlearning.com \|xiBAHBDy01745lz[
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