The sun and its planets formed between 5 and 4.6 billion years ago as matter in our solar system began to coalesce because of gravity. By about 3.9 billion years ago, the Earth had an atmosphere that contained the right mix of hydrogen, oxygen, carbon and nitrogen to allow for the creation of life. Scientists believe that the energy from heat, lightning, or radioactive elements caused the formation of complex proteins and nucleic acids into standards of replicating genetic code. These molecules then organised and evolved to form the first simple forms of life. 3.8 billion years ago, conditions became right for the fossilisation of the Earth’s early cellular life forms. These fossilised cells resemble present – day cyanobacteria. Such cells are known as prokaryotes . Prokaryote cells are very simple, containing few specialised cellular structures and their DNA is not surrounded by a membranous envelope. The more cells of animals and plants, known as eukaryotes, first showed up about 2.1 billion years ago. Eukaryotes have a membrane – bound nucleus and many specialised structures located within their cell boundary. By 680 million years ago, eukaryotic cells were beginning to organise themselves into multicellular organisms. Starting at about 570 million years ago an enormous diversification of multicellular life occurred known as the Cambrian explosion. During this period all but one modern phylum of animal life made its first appearance on the Earth.
Published by etutor2017
I AM VERY ENERGETIC & DESERVE FOR PEOPLE FOR SHARING MY EXPERIENCE OUT OF MY WORKING EXPERIENCE. BEFORE I START MY BLOG, EVERY SINGLE DAY DURING MY WORKING HOURS I SEE SO MANY PEOPLE VISIT OUR OFFICE FOR ENQUIRY ABOUT DIFFERENT TYPES OF PUBLIC RELATED SERVICE, EVEN SOME OF THEM TELL ME THEY PAY MONEY TO THE BROKER JUST GETTING SUCH SERVICE THAT IS FREE FOR THEIR. THEN I REALIZE, WHY IT'S HAPPEN. ANSWER ONLY ONE " DUE TO LACK OF KNOWLEDGE AND UNAWARE OF THE MODERN TECHNOLOGY".AS ONLY REGIONAL AND YOU CAN OBVIOUSLY SAY FROM MY SELF INSPIRATION, I START MY BLOG AS "eTutor" FOR SHARE MY EXPERIENCE, AWARE PEOPLE ABOUT MODERN TECHNOLOGY, SHARE EVERY ORDERS, CERCULAR, MANY MORE RELATED TO GOVERNMENT SECTOR, SHARE PROCEDURE FOR RETRIEVING THE SERVICES THAT'S ARE AVAILABLE FOR PEOPLE FROM GOVERNMENT, MANY MORE RELATED TO AWARNESS OF PEOPLE. ATLAST, FROM MY HEART I ADMITTED THAT I AM VERY POOR IN ENGLISH LANGUAGE, BUT, ALLWAYS I TRY TO SHARE MY EXPERIENCE WITH MY OWN IDEA THAT'S TOUCH THE HEART OF THE PEOPLE AND ALSO MYSELF. ONCE AGAIN , REMEMBER THIS BLOG CREATING BY ME ONLY EXPRESSING OF MY OWN THINKING DURING MY LEARNING TIME AND INSPIRATION TO SHARE REAL LIFE AND TESTED EXPERIENCE WITH PEOPLE. eTutor DOESN'T PROVIDE ANY FICTITIOUS ARTICLE OR FAKE POST. ALLWAYS, I WILL BE VERY THANKFULL TO THEM WHO ARE REALY ADVICE ME TO IMPROVE MY BLOG AS WELL AS MY ARTICLE OR COMMENTS WITH MY ARTICLE. View all posts by etutor2017