How life starts on earth

-

Earth evolution

 Life Approximately three and a half years ago, microscopic single-celled organisms made of complex organic molecules appeared deep in these new oceans, when the land was still a hostile place dominated by volcanoes. These organisms were the most advanced life-forms on the planet for another three billion years until suddenly (relatively speaking that is), within the period of a few million years, bacteria in the sea began processing carbon dioxide, water and sunlight to produce oxygen. This helped the single-celled microbes in the sea begin to stick to each other and create multi-cellular organisms that grew into animals.

Pre life on earth was bacteria



These animals began to reproduce, to evolve and eventually, when there was enough oxygen in the atmosphere to protect against the sun's radiation, to crawl onto land. Amphibians, insects, reptiles, mammals and birds all arrived on land, more or less in that order, over the next few hundred million years. At least that is the generally accepted version of events, but creationists ridicule this theory, arguing that it is not possible for a frog to become a human, regardless of the time frame.

Once life started it took a number of different forms, most of which we will never know as geologists recognise at least five episodes in the history of our planet when life was destroyed. suddenly and extensively, in mass extinctions. We have no idea what caused such extinctions; suggesstions have Eastefrom meteor impacts to solar flares and volcanic upheavals. all of which may have caused sudden global warming, global cooling, changing sea levels, or epidemics.

The two largest extinctions to have occurred were the Permian Mass Extinction and the K-T Extinction. The Permian Mass Extinction of 250 million years ago wiped out up to 96 percent of species existing at the time due to drastically declining oxygen levels. The K-T Extinction of 65 million years ago destroyed the dinosaurs that had already roamed our planet for close to 150 million years.

This puts the six or seven thousand years since the appearance of the first proper human civilisations into perspective. Given the length of time in which we have existed in relation to the beginning of our planet, it is not unimaginable to think that human life will also become extinct - and perhaps a lot sooner than we think - for any one of the above or other reasons.


Comments

Post a Comment

Popular posts from this blog

THE Afghan Taliban’s and girls education

-
Image
No Education for girls in afghanistan   THE Afghan Taliban’s announcement of the indefinite closure of girls’ schools just two days after their education ministry released a congratulatory video is both disappointing and deeply concerning. On March 21, the Taliban said they would lift a seven-month-old de facto ban on girls’ education from Class 6 onwards and reopen schools on the first day of Afghanistan’s new academic year. Two days later, the Taliban backtracked, saying they were putting in place policies compliant with the “principles of Islamic law and Afghan culture”. One report said the education ministry was facing a shortage of teachers, following the exodus of thousands of Afghans, many among them trained teachers, after the Taliban’s triumphant march into Kabul last August. A senior Taliban figure said the schools would be reopened after a “standardised uniform” for girls was introduced that reflected the Afghan culture. But there was also a report suggesting deep divisions
Read more

How we make our skin healthy

-
Image
 your glowing puts good impression on others at first look. Glowing skin How we make our skin healthy and shinning. Diet and supplement. Supplements: Vitamin C: is very good for our skin and also makes our immune system strong .we can take it through food or through food we must eat citrus fruits like orange etc Vitamin C food Vitamin c supplement available on pharmacy  .One tablet daily 500mg Vitamin C supplement Evion supplement: .Vitamin E reduce your hair fall .It repair your skin damages. .will reduce your oldness Dosage .take 2 tablets in a week 400 mg. Diet plan:- Almonds :-use soaked almonds 8 to 10 before breakfast . It also reduce your oldness. It makes your heart strong. Soaked almonds Honey  Mix two teaspoons in water or milk and drink Honey  Detox water.obse people use detox water before going to sleep. Use fresh salad vegetable daily. Detox water Dates:-eat three dates daily. Dates Avoid following foods:- .Fast food .Fried food  .Cold drinks Thanks for reading. 0302560085
Read more

Sexually transmitted diseases(STD)

-
Image
 Unhealthy attitudes and low moral values sometimes lead to serious complications.The carrier may transmit this disease to healthy partners. 1.gonorrhoa Its is casued by gram positive bacteria (neisseria gonorrhoeae)mainly affect the mucos membrane of urinogenital tract. New born infants may acquire serious eye infections if they pass through the infected birth canal. Its is highly contagious through sexual contacts Infant infected by gonorrhoa 2.syphilis It is caused by spirochaete,treponema pallidum. It damages the reproductive organ,eye bones joints,central nervous system.Heart and skin is the major source of its spreading. Man body parts infected by syphilis 3.Genital Herpes It is caused by herpes simples type 2 virus ,mostly frequently transmitted by sexual contact causing infection of the genitalia.it prodices genital soreness and ulcer in in infected areas. In infected pregnant woman,virus can be transmitted to infant during birth ,causing damaging to eyes and CNS of the infant.
Read more