The organisms in the Cretaceous period and Permian Period are now extinct.
The emergence and demise of specific living forms are represented by time periods on the geologic time scale that span hundreds of millions of years. A mass extinction is a period of geologic time when a large number of plant and animal species go extinct, sometimes within a few thousand to a few million years.
Life has recovered after each of the five significant mass extinctions that have taken place during the past 500 million years. Because it led to the extinction of the dinosaurs, the mass extinction at the end of the Cretaceous Period is the most well-known. However, the Permian Period's end saw the most extreme one in terms of the number of species destroyed.
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Sustainability is the ability of a biological system to sustain itself indefinitely to remain indefinite and productive, in an ecological sense. Conservation and Stewardship of our natural resources relate to this, as it is the impact of human development, industry, and consumption that is putting a strain on our environment and its natural ability to sustain its systems. With careful approaches to the environment, we can minimize our negative impact on the Earth and support the ecosystem to be sustainable through conserving the landscape and taking care of the natural resources available to us.
<span>The story of North American exploration spans an entire millennium and involves a wide array of European powers and uniquely American characters. It began with the Vikings’ brief stint in Newfoundland circa 1000 A.D. and continued through England’s colonization of the Atlantic coast in the 17th century, which laid the foundation for the United States of America. The centuries following the European arrivals would see the culmination of this effort, as Americans pushed westward across the continent, enticed by the lure of riches, open land and a desire to fufill the nation’s manifest destiny.</span>
B. His mass would increase due to gravity on Earth.
