With much of the growth from tropical to polar climate, vegetation of the United States are very diverse. The United States has more than 17,000 species of native plants are identified, including 5,000 in California (the tallest tree, to most, and the oldest in the world). [29] more than 400 species of mammal, 700 bird, 500 reptile species and species that live on land under water, and 90,000 insect species
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