How was life started on earth?
460581
it started with chemicals ,followed by ,very simple unicellular things,they worked there way up to amoebas,and it was only a couple of million years to get to bacteria and stuf like coral after that ,then it becomes complicated,\n\nhumans came from out of space i think,they were put here and primitive beings that were already here were maybe genetically improved by those who came from the stars.\n\nas to how humans come ,that is another question
1164312
Yet another interesting question, man_id.\n\nAll a theory of abiogenesis can do is give an answer for how life-from-non-life is *possible*.  ... I.e. what ingredients and conditions might result in a replication system that is sufficient for natural selection to take over?  And which ones *may* have been present in the early days of the earth (knowing what we do know about those days)?  There may, in fact, be multiple answers ... many different recipes, all equally possible.  If so, then we may never know which one actually occurred on our planet.\n\nBut it is also possible that we may never find a recipe that works that we know might have been available in the earth's infancy.  We've only started looking.
60092
READ THE WHOLE THING! IT MAY HELP YOU!\nWell i can see by looking at the other answers that there are a lot of different theories about human life. First of all i don't believe what Charles Darwin said about human life. Now i really don't care if you don't agree with me. this is what happened. Humans came to be from dust. That is why when we die we return to dust. you can find this in the first book of the Bible, Genesis. Now about what started life. First, just to put it out there, a what didn't start life, a who did. That who is God. Now i know that you might not agree with me but if there is the slightest chance that you would be willing to learn more abou this you should look in the Bible.But i do know that if you were to ask this question and not want to learn about other religions, you would have to be stupid because anyone who asks a serious question like this has to be looking for an answer and if you are looking for peace and a knowledge that you're safe and there is a better place out there you should think about my answer and if you like it, which you might not, you should think about finding a Bible and readind the first chapter of the book of Genesis.
517391
well you say animals...so I think the first animals would have been similar to that of fish due to the large area occupied by water. And they would have no bone, probably use their skin to breathe.\nIf you're talking about bacteria...then yes, it would have to anaerobe because it is believed that the first form of life was some sort of bacteria and at that time there was no oxygen present.\nAnd I think plants too were first found in water.
1057616
No one found life on Earth as life was made on Earth, we evolvolutionised from bacteria that was by nothing but infectious static.\nAliens found life on Earth and put you on it as everything that I know that is from this planet didn't come from another world we were made from the soil.
51857
There is a chance that there is life not on earth, but think about the perfect conditions for life that earth has: the perfect temperatures, the correct mixture of oxygen and other gases, and of course, water. If there were life not on earth, it would probally be 1-celled organisms, and not what we would expect.
280906
Supposedly the universe is estimated to be about 13.6 billion years old.  I think I read that on Wikipedia, though, so you never know...\n\nThat said, I really have so little idea what is out there or what conditions are necessary for life to arise that I don't know which theory is more plausible.  How flexible are the conditions that lead to the formation of primative cells on Earth?  Can there be life based on an entirely different set of molecules?  An entirely different set of elements (i.e. not carbon based)?  How many other planets have chemical compositions and climates like Earth?  Did life even originate on Earth? (I've heard the theory that primative cells could have originated on another planet and been brought here on an asteroid).  Could primative cells have left Earth on some sort of asteroid and taken up residence elsewhere?\n\nI'd like to think there's other life out there, just because it makes things more interesting.  Until I have reason to believe otherwise, I'll assume there is.
1125363
No one knows when, where or how human life began on this planet. It's all speculation. Some of the theories are based on scientific evidence, but everyone knows that they are just possible scenarios and full of gaps.\nSomeone lied to you by saying that "white people were allways apriciated" and that "black people...were the "sclaves" of white people. It just nonsense that racists use to assert that black people are sub-human or animals. \nIf you believe that Adam and Eve were the first humans ever, and that God created them, and we are all direct descendants, and no other humans can or have ever existed on this planet; then you're basically screwed because nothing in life will ever make sense.
251225
it was a ball of burning gas that seperated from the sun billions of years ago, got trapped in the suns gravity and began revolving around it, and in time it cooled down and formed the earth, but it was still too hot for life, it cooled more and more and the atmosphere shaped from the fumes rising from it, eventually it rained and made huge oceans on earth which later became the home for the first cells that later made all different living things.
661513
The earth came into existence by some as yet undetermined process, the most likely of which was a "big bang" whereby all existing planets and solar systems began to form into their current transitory states. During that process, animal life began to form on the earth, by yet another unknown process. The earth is currently in a state of transition that will eventually result in its return to the previous unknown condition that resulted in the "big bang."\n\n\n\nNow send me $5 or I'll put a curse on you.
1031230
Errr, not really.\n\nYou must also understand that evolution in no way says anything about the origins of life.  That's a whole other subject ;).
117510
The ingredients to make life are quite simple. They (aminoacids, nukleotides, fattyacids, sugars) have been found on many off world places such as comets, meteorites and interstellar molecular clouds. Knowing that the ingredients are common and form easily they just need to be exposed to an energy source, like a star, while suspended in a medium (water) and exposed to catalysts (like clays rich in metallic oxides), that greatly speed things up, and eventually more and more complex substances will form. The magic ingredient is time. No God is required to make life, the planets or the universe. It took some 3.8 billion years for life to evolve from the primordial soup to us. Give me that much time to toy around and I´ll build you a staircase to the moon using nothing but a teaspoon.
38211
Check out the source below, there are great animations there as well as the following information:\n\nThe origin of the Earth\nThe age of the Earth was once, and still is, a matter great debate. In 1650 Archbishop Ussher used the Bible to calculate that the Earth was created in 4004BC. Later on in the mid-nineteenth century Charles Darwin believed that the Earth must be extremely old because he recognised that natural selection and evolution required vast amounts of time. \n\nIt wasn't until the discovery of radioactivity that scientists began to put a timescale on the history of the Earth. Rocks often contain heavy radioactive elements which decay over long periods of time, the decay is unaffected by the physical and chemical conditions and different elements decay at different rates (These rates are slow and half-lifes of several hundred million years are not uncommon)\n\nThroughout this century the race has been on to discover the oldest rocks in the world. The oldest volcanic rock found so far has been dated at 3.75 billion years old, but this is not the whole story. Meteorites created at the same time as the Earth hit us all the time, radioactive dating shows that they are about 4.55 billion years old.\n\nTHE EARLY ATMOSPHERE\n\nThe present composition of the atmosphere is: 21% OXYGEN \n 78% NITROGEN \n 0.04% CARBON DIOXIDE \n ~0.9% ARGON \n\nThe atmosphere wasn't like this when the Earth was created over 4½ billion years ago.\n\nTHE FIRST BILLION YEARS\n\nThe Earth's surface was originally molten, as it cooled the volcanoes belched out massive amounts of CARBON DIOXIDE, STEAM, AMMONIA and METHANE. There was NO OXYGEN. The STEAM condensed to form water which then produced shallow seas. \n\nEvidence points to bacteria flourishing  3.8 billion years ago so this means that life got under way about 700 million years after the Earth was created. Such early forms of life existed in the shallow oceans close to thermal vents, these vents were a source of heat and minerals. \n\nTHE NEXT BILLION YEARS\n\nThese primitive life forms then took the next evolutionary step and started to PHOTOSYNTHESISE (using sunlight to convert carbon dioxide and water to food energy and oxygen). This was an important turning point in Earth history because the carbon dioxide in the atmosphere was being converted to oxygen. \n\nThese green plants went on producing oxygen (and removing the CO2).  \nMost of the carbon from the carbon dioxide in the air became locked up in sedimentary rocks as carbonates and fossil fuels. Carbon dioxide also dissolved into the oceans. \nThe ammonia and methane in the atmosphere reacted with the oxygen.  \nNitrogen gas was released, partly from the reaction between ammonia and oxygen, but mainly from living organisms such as denitrifying bacteria. (remember that nitrogen is a very unreactive gas and it has built up slowly).  \n\nTHE LAST 2½ BILLION YEARS OR SO\n\nAs soon as the oxygen was produced by photosynthesis it was taken out again by reacting with other elements (such as iron).This continued until about 2.1 billion years ago when the concentration of oxygen increased markedly. As oxygen levels built up and then . . . . . . \n\nThe ozone layer was formed which started to filter out harmful ultraviolet rays. This allowed the evolution of new living organisms in the shallow seas.
333564
If you look at the history of life on earth, there are several steps where things seem to be difficult. Life starting at all seems to have been relavtively easy. The earth cooled down enough by 3.8 billion years ago to have liquid water. By 3.5 billion years ago, there was bacterial life. So *at most* 300 million years was needed for this transformation.\n\nThe next bigstep was the transition from bacterial (call procaryotic) to cellular life with nuclei (eucaryotic life). This happened about 2 billion years ago and so took about 1.5 billion years to accomplish. At this time, cells also started producing oxygen, which lead to a massive die-off.\n\nAfter this, multi-cellular life appeared about 570 million years ago, so another 1.5 billion years after eucaryotic life. \n\nGiven the length of time needed for these transitions on earth, it appears that going from bacterial life to multi-cellular life was very difficult. After multi-cellularity was achieved, it only took about 570 million years to produce humans and technological life.\n\nSo my guess is that bacterial life is very common in the universe, but multi-cellular life is probably rather rare. There are other considerations about how long a technological civilization would last, but that is another issue.
96907
Life begins when we realise the purpose behind our existence. Life is not just taking birth, thats just the existence. \n\nExistence + Wisdom = Life\n\nA scientist may answer to this question in a very different manner and a philosopher may answer something else.
246724
OK, according to the Bible, the creation of the heavens and the earth was "the beginning". So, we don't know what God was up to before that time (and in most views, this is irrelevant because God is 'timeless').\nWe are given no explanation of where God came from, it is simply assumed that God always has been (no matter what belief system, Evolution, Christianity, Islam, Judaism, Hindu, or any other, there comes a point where you simply have to say "I don't know where it/He/we came from").\nBack to the Bible ... Since 'the begining' is the creation of heavens and earth, NOTHING (other than God) existed before that time. God then began a process of 'forming' and 'filling' His creation. This process took Him six days. On day one, He created light and separated it from the darkness, calling it one day. This was the forming of the heavens (space/time).\nOn day two, He formed the atmosphere by separating the waters above from the waters beneath.\nOn day three, He begins to fill what He has formed, starting with the earth, separating the water from the land, and filling the land with growing things (plants).\nOn day four, He fills the heavens (above the atmosphere) with the sun, moon, and stars (probably the angels were created on this day as well).\nOn day five, He fills the water with fish (and other water-dwelling creatures), and the firmament (atomosphere) with birds (and other flying creatures)\nOn day six, He filled the land with all land-dwellers and created man in His own image to rule over the earth as the Vice-regent of God. \nOn day Seven, God rested from (stopped) the work of creation.\nNow, Genesis chapter 2 is often mis-understood to be a contradiction of Genesis 1 because of some differences in the order of creation, and some added details, so I will try to give a little understanding to this. Have you aver read a newspaper headline? Gen. 1 is the 'headline' and the main article is in Gen. 2. This is a detailed account of what happened on day 6, where God made a garden, placed the man in the garden, and then created one of each 'kind' of creation right before his eyes so the man could name them and rule them in equity. Then God created the woman to be with the man (by this time, Adam knew he needed a mate too!)\nIn the garden Adam and Eve had only ONE restriction - They were free to do ANYTHING they wanted to do with the exception of eating the fruit of the tree of the knowledge of good and evil. They were clearly told the penalty of this would be death.\nIn spite of this knowledge, they both ate of the tree, and as a result, death entered the world, and the perfect creation of God was ruined. Instead of killing Adam and Eve though, God provided a 'loophole' in the law, and an animal (probably a lamb) was killed instead. In this way Adam and Eve saw the result of their sin brought death into the world, but God spared their lives for the time. By clothing them in the skins of the animal killed in their stead, God was giving them a constant reminder of the result of sin, and reminding them that He accepted them through the substitution of the animal killed in their place.\nThen God makes an extraordinary promise (Gen. 3:15) That the seed of the woman would crush the head of the serpent who deceived her.\n\nWe now skip ahead to a time when evil has grown on the earth to the point God can no longer stand it (Gen. 6), and men have stopped caring whether or not they are in right standing with God, forsaking the sacrifice, and offending God in all their thoughts and deeds (possibly because even though Adam lived to the age of 930 years, he eventually did die). \nBut there is one man (Adam's great, great, great, great, great, great, granson) who is still seeking God, and observing the sacrifice for atonement of sin. This man's name was Noah, and God judged the entire world with a flood, but spared Noah and his family (as well as each k
1008648
If there was no Sun, there would be very little life on Earth. Sunlight supports almost all life on Earth via photosynthesis, and, via heating from insulation, drives climate and the weather cycle.