Give your reasons for why the organisms become extinct.
Answers
Answer:
There are five major causes of extinction: habitat loss, an introduced species, pollution, population growth, and overconsumption.
Answer:
#1 Natural disasters
We can conjecture with a bit more confidence what causes the extinction of more obvious species. If a species has only a small, local population, a natural disaster such as a fire, volcano, hurricane or tsunami can decimate the species in one fell swoop.
Natural disasters will be touched upon again as an anthropogenic cause as recently, an overabundance of greenhouse gas emissions in the atmosphere caused by the copious burning of fossil fuels has led to more tempestuous weather than ever before recorded.
It is treated here, and for the purposes of this argument can also include toxins in the air, water and land that are adversely affecting us because from one vantage point the our activities can be considered as natural behavior as we are mammals.
#2 Changes in the weather
Extended droughts, prolonged flooding or sudden extreme changes in temperature can deplete the food source of a species causing starvation.
If a species does not have the ability to migrate for whatever reason, the creatures may not survive the bitter elements.
#3 Disease
The introduction of a new disease or a parasite to which a species has not evolved a resistance or defense can decimate a species.
Anthropogenic causes of species extinction
#1 Habitat loss
Small land animals and birds have been declining due to habitat loss.
There is only so much room on earth and the human population is growing exponentially. While there is some hope that species can co-exist with humans, the anecdotal evidence of the possibility is slim. There are reported sightings of mountain lions in Los Angeles, coyotes in Chicago and leopards in Mumbai.
As more homes are being built, more land cleared for agriculture and industry, more roads being constructed, gas pipelines laid, as cities and their infrastructure expand, animal habitats are being eliminated or fragmented.
Many suburban areas still serve as homes for squirrels, rabbit, deer and birds, but every road has evidence of the risks for these small animals. Larger animals are generally removed or shot through fear or as trophies.
Some smaller animals have adjusted to urban and suburban environments, but by no means all have adjusted to the elimination of their natural habitats by human development.
History shows us that as a species becomes fragmented, its numbers dwindle.
The remaining members will not only face new pressures from its new habitat in the form of unfamiliar predators to which it has not adapted and uncertain food sources, and possibly heavy noise, road and human traffic and bright lights and very limited habitat options.
If they must migrate, they will also confront different weather to that which they are acclimated.
#2 Pollution
The advent of the environmental movement is generally attributed to a seminal book by Rachel Carson in 1962 called Silent Spring, silent to the dearth of songbirds caused by their poisoning by DDT, a pesticide sprayed ubiquitously at the time.
Agribusiness and homeowners are still applying pesticides, herbicides, fungicides and defoliants, and at an unprecedented rate.
We have dead zones in our oceans and lakes from eutrophication . Half of our topsoil has been lost over the past 150 years due to industrial activities and the acid rain that deposits their byproducts far distances and one-third of arable land has been lost to desertification . This means that the soil hosts no organisms.
#3 Overexploitation
Following habitat loss, overexploitation is the second major threat to many species.
We will run out of seafood by 2048 if overfishing continues at the present rate.
And the growing international black market trade in illegal wildlife is estimated to account for only slightly less than illegal narcotic sales. It is presently a ten-billion dollar annual industry.
#4 Climate change
Climate change is listed here as an anthropogenic cause because of the dramatically accelerated rate of warming since the dramatic rise of the use of fossil fuels in industry and transportation .
There has been a lot of attention on a few species of animals who do not appear to be able to adapt to our changing climate.
Everyone has seen photographs of the polar bears losing their habitat in the Arctic as they drift helplessly on chunks of ice from melting glaciers.
The loss of habitat for one species affects many others.
What will happen if all animals become extinct?
If the human population continues growing at its present rate [11] and the species extinction rate continues on its trajectory and we do not learn to co-exist with animals, it is likely that animals, fish and birds will become extinct.
How will this impact us? Why does the loss of species matter?
The natural balance sustaining healthy, well-functioning ecosystems is contingent upon biological diversity. The loss of a key player in an ecosystem compromises and can easily destroy its ability to operate effectively.
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