Some kinds of organisms found great success with their strategies and they marginalized other kinds and even drove them to extinction, to only die off themselves in a mass extinction event, and the previously marginalized life forms flourished in the post-catastrophic biome. The rise of might have never happened without the dinosaurs’ demise. Mass extinction events account for less than five percent of all species extinctions during the , but they had a profound impact on complex life’s history; the rise of mammals is only one of many radical changes. Not only would a class of animals such as mammals thrive when their dinosaur overlords were gone, but the of mammal evolution was also influenced. It took millions of years, even tens of millions of years, for ecosystems to approach their former level of abundance and diversity after a mass extinction event, and the new biomes could appear radically different from the pre-extinction biome. The geologic periods in the eon of complex life usually have mass extinctions marking their boundaries.
When humans began to raze forests and use the resultant soils to raise crops, they were working their way down through the food chain, no longer harvesting ecosystem detritus but destroying entire ecosystems literally at their roots for short-term human benefit. That practice eventually turned forest ecosystems into deserts. As this essay will survey, that was a rampant problem in all early civilizations. Eventually, humans learned to reach even further back into the ecological horizon as they began burning energy stores that were hundreds of millions of years old; was first and second. They were burned a million times as fast as they were created. In all instances, humans were releasing sunlight energy that had been captured and stored by organisms. In the 20th century, when humans began using nuclear fission, they were going even further back in time and harvesting energy stored via billions of years ago. With each new energy source, humans were harvesting older, more concentrated energy sources, which released far more energy than the previously used source. In each instance, humans plundered the energy source to exhaustion. Humans have not lived in “harmony” with nature since they learned to control fire.
Diversity in the united states essay - …
When Europeans invaded Australia in the late 1700s, the aborigines they encountered were in a state of almost constant warfare. What seems to be the case is that the founder group of Australia lived in the easy meat days and they grew and spread across the continent in a few thousand years. Once the golden age based on easy meat ended, they reverted back to their territorial natures and formed 600 separate societies, with between 500 and 1,000 people in each one. They all had unremitting hatred for their neighbors, with whom they were in constant warfare. The aboriginal genetic diversity supports the idea that those societies did not interbreed with each other, but stayed insular. They were all patrilocal and violent.
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Diversity in America Essay - 1300 Words - StudyMode
We need to give each other space so that we may both give and receive such beautiful things as ideas, openness, dignity, joy, healing, and inclusion." -- Max de Pree Workplaces today have become increasingly diverse with employees of different genders, races, cultures, ethnic origins, and lifestyles.