The dry mountain ranges of the western united states contain rocks dating back

The dry mountain ranges of the western united states contain rocks dating back

The fauna of the Rockies is varied and abundant. Among the large mammals emblematic of the rugged backcountry are the black bear , grizzly bear , mountain lion , and wolverine. Bighorn sheep and mountain goats inhabit the high crags in summer and migrate to the lower slopes for the winter months. Members of the deer family, such as the caribou, elk wapiti , mule dee r, and white-tailed deer , also migrate vertically between alpine meadows and subalpine forest cover; the solitary moose frequents northern lakes, streams, and marshy areas, feeding on willow foliage and aquatic plants. Wild horses and burros inhabit the surrounding plains, while coyotes roam the lower valleys and along roads and rail routes.

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Alaskan mountains | mountains, United States | GETDWELLNESS.COM

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Rocky Mountains

Alpaca , sinsevia. GWD32— The dry mountain ranges of the western United States contain rocks dating back to million years, Line to the Ordovician period, and teeming 1 with evidence of tropical marine life. This rock record provides clues about one of the most significant radiations periods when existing life-forms gave rise to variations that would eventually 10 evolve into entirely new species in the history of marine invertebrates. During this radiation the number of marine biological families increased greatly, and these families included species 15 that would dominate the marine ecosys- tems of the area for the next million years. Although the radiation span- ned tens of millions of years, major changes in many species occurred 20 during a geologically short time span within the radiation and, furthermore, appear to have occurred worldwide, suggesting that external events were major factors in the radiation.
Which of the following can be inferred from the passage regarding the geologic changes that occurred during the Ordovician period? The dry mountain ranges of the western United States contain rocks dating back to million years, to the Ordovician period, and teeming with evidence of tropical marine life. This rock record provides clues about one of the most significant radiations periods when existing life-forms gave rise to variations that would eventually evolve into entirely new species in the history of marine invertebrates. During this radiation the number of marine biological families increased greatly, and these families included species that would dominate the marine ecosystems of the area for the next million years. Although the radiation spanned tens of millions of years, major changes in many species occurred during a geologically short time span within the radiation and, furthermore, appear to have occurred worldwide, suggesting that external events were major factors in the radiation.
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