Download PDF by Julie Kerr Casper PhD: Animals: Creatures That Roam the Planet (Natural Resources)

By Julie Kerr Casper PhD

ISBN-10: 0816063532

ISBN-13: 9780816063536

ISBN-10: 143810555X

ISBN-13: 9781438105550

Throughout the process hundreds of thousands of years, animals have tailored to numerous environments in the world. even supposing animals have advanced over geologic time to Earth's consistently altering environments, and even though the extinctions of yes species are common, in no different time within the planet's historical past has the extinction expense climbed as excessive because it is at the present time. explanations of this unparalleled extinction fee contain destruction of natural world habitat, pollutants, overfishing, and poaching. "Animals" illustrates those pressing concerns in a way available to heart and highschool readers.

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Animals: Creatures That Roam the Planet (Natural Resources) by Julie Kerr Casper PhD PDF

Throughout the process hundreds of thousands of years, animals have tailored to numerous environments on the earth. even though animals have advanced over geologic time to Earth's consistently altering environments, and even though the extinctions of yes species are basic, in no different time within the planet's historical past has the extinction expense climbed as excessive because it is this day.

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For example, scientists believe that the Bering Land Bridge that existed between Alaska and Russia when the sea level was lower was used by many species—such as Siberian huskies and even humans—to migrate from Russia to North America. After the sea level rose, the land bridge disappeared beneath the ocean. Islands have been a prime target for the study of animal (and plant) adaptation. By their very nature, islands are isolated and serve as a type of living laboratory of evolution. Animals and plants can arrive on islands by being carried on air currents during storms or by ocean currents.

By 1680, the dodo had become extinct. Evolution, adaptation, and extinction through time practices in the rain forest and urbanization in the developed world, thousands of species are being driven to extinction—from micro­ organisms and small insects to large mammals. Humans may be the driving force in modern mass extinction, because species are being lost at a rate that is several hundred times more than the “natural” extinction rate. Animal Distributions Around the World There are several factors that determine the distribution of animals.

Animals—like penguins—cluster in large groups of several thousand to keep each other warm. In Antarctica, some animals have developed a special protein compound that allows them to be able to withstand extreme temperatures. In the African grasslands, speed is an important adaptation for animal survival. Because there are few trees or places for animals to hide, speed is important for both predators that are hunting and the animals that are fleeing them. 17 18 animals A polar bear is an example of an animal that has had to adapt to survive in its environment.

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Animals: Creatures That Roam the Planet (Natural Resources) by Julie Kerr Casper PhD


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