Evolution can be the cause of extinction. Tis can be by overpopulation which is when we have a very powerful group kill out an organism. Also, less land for a species can cause the rate of deaths to be greater than the births. Then, if the new species is to strong it can mess up the entire food chain. This proves that evolution may cause new species but, it isn’t always good.
And the fossils they found suggest that there have been five mass extinction passed in the Earth’s history. And the most well-known mass extinction is the Cretaceous the tertiary mass extinction and this is resulted in the disappearance of the dinosaurs sixty-five million years ago. And if the extinction is part of natural event, why are we concerned about it now? Because the rate of extinction is higher that the natural rate that does not allow the ecosystem to recover or other species to occupy the vacant niches. And it is also because the primary cause of extinction is the human kind that is abusing the nature.
In some case “human activities have been and are continuing to alter the environment on local and global scales. Many of these changes are leading to dramatic changes in the biotic structure and piece of ecological communities, either from the mislaying of species or from the introduction of exotic species. Such alterations can preferable change the ways in which ecosystems work. Altered biodiversity has led to widespread cover for a number of both market (e.g., ecotourism, “mining” for medicines) and non-market (e.g., ethical, aesthetic) explanation” (Barbier et al. 1995, Kunin and Lawton 1996, Schwartz et al.
A pressing social problem prevalent in the world today is the destruction of marine habitats which leads to the loss of food for humans. I am going to discuss the many causes of the deterioration of the marine habitats such as development, chemical run off into water supplies, bottom trawling and dams. “Habitat loss in these areas have far-reaching impacts on the entire ocean 's biodiversity” says National Geographic (2014). Our population is growing at an exponential rate; according to National Geographic (2018) they predicted that by 2050 (which is only 32 years away) that the population will grow by 2 billion more people. This means our planet will need to sustain 9 billion people.
Technological and industrial advancements may have ushered humans into an unprecedented age of wealth and comfort, but at a cost. Global warming anxieties are only the tip of the iceberg of problems we are facing in exchange for the improved lifestyles we are now leading. The rapid endangerment and extinction of plants and animals due to our high consumption patterns features just as greatly, if not more than the loss of biodiversity in our physical environment. As we clear away vast quantities of land for our urban developments, we also destroy the environment that is vital to the wellbeing of our ecological existence. Along with the destruction of our terra firma and its inhabitants, the oceans are not spared from our insatiable lust of for consumption.
Recent changes in climate have already had significant impacts on biodiversity and ecosystems in certain regions. As climate change will become more severe, the harmful impacts on ecosystem services are expected to outweigh possible benefits, such as a longer growing season, in most regions of the world. Climate change is expected to exacerbate risks of extinctions, floods, droughts, population declines, and disease outbreaks. Many drivers affecting biodiversity are stronger today than they were in the past and are also occurring together. Because exposure to one threat often makes a species more susceptible to another, multiple threats may have unexpectedly dramatic impacts on biodiversity.
One of the leading causes of extinction is deforestation. Rainforests are homes to many species of animals that thrive in the humid environments. When these rainforests are destroyed, there can be a substantial decrease in wildlife. Many animals are not able to thrive in a secondary habitat and have no place to go when their homes are demolished.
Introduction Extinction is defined as the end of an organism or of a group of organisms, normally a species. This phenomena is marked by the death of the last individual of the species, however the capacity to breed and recover may have already been lost. Extinction is a topic of great ecological importance because of its effects on biodiversity. Many recent studies focused on the conservation of species have put great effort into understanding these ecological factors that contribute to extinction (Slater et al. 2014).
Threats to Biodiversity Extinction is a natural part of life on Earth. Over the history of the planet most of the species that ever existed, evolved and then gradually went extinct. Species go extinct because of natural shifts in the environment that take place over long periods of time, such as ice ages. Today, species are going extinct at an accelerated and dangerous rate, because of non-natural environmental changes caused by human activities. Some of the activities have direct effects on species and ecosystems, such as: Habitat loss/ degradation Over exploitation (such as overfishing) Spread of Non-native Species/ Diseases Some human activities have indirect but wide-reaching effects on biodiversity,