If bacteria was the first life form on earth where did it come from?

Bacteria was not the first "life" form on Earth. Bacteria are descendant from simpler life that did not have the complexity of bacteria. That "life" evolved from a self replicating organic molecule that was made up from common amino acids and proteins. These first "life" forms were even simpler than viruses. Those self replicating molecules come about when you mix large quantities of amino acids, hydrocarbons, proteins, water, and heat (all of which were common and result from natural processes) with enough time (roughly 100 million years once the oceans began to form on the early Earth). Life is the natural consequence of carbon based chemistry. The problem most people have with understanding the process is that they really don't follow all the evidence all the way to the true conclusions. They stop because its "Too hard to learn all that organic chemistry." or it conflicts with preconceived ideas.

If bacteria was the first life form on earth where did it come from?
EXACTLY!!! Thats why evolution doesnt make any sense!!
Reply:From God? LOL what a question....
Reply:You are asking the age old question that there will never be an answer to. Why are we here? No way of finding that one out. Because as humans we believe that something has to start from something, therefore that question will forever be impossible to ask. If god is true, which I hope he is, hopefully we will find out when we die.
Reply:I saw a video in science class once and it said that there was a theory that there were cells and in nature cells have to split, cell splitting is inevitable, so thats why more advanced life forms started
Reply:many scientists theorize that an asteroid of some kind that may have had simple organisms on it may have collided with earth. after that, the bacteria would have evolved
Reply:Earth is a planet teeming with vitality and is home to billions of plants and animals that share a common evolutionary track. How and why did we get here? What processes had to take place for this to happen? And where do we go from here? The fact is, no one has been able to come close to knowing exactly what led to the origins of life, and we may never know. After 4.5 billion years of Earth's formation and evolution, the evidence may have been lost. But scientists have made significant progress in understanding what chemical processes that may have led to the origins of life.





There are many theories, but most have the same general perspective of how things came to be the way they are. Following is an account of life's beginnings based on some of the leading research and theories related to the subject, and of course, fossil records dating back as far as 3.5 billion years ago.


Earth began to form over 4.5 billion years ago from the same cloud of gas (mostly hydrogen and helium) and interstellar dust that formed our sun, the rest of the solar system and even our galaxy. In fact, Earth is still forming and cooling from the galactic implosion that created the other stars and planetary systems in our galaxy, a process which began about 16 billion years ago as the Milky Way began to form.





As our solar system began to come together some 6-7 billion years ago, the sun formed within a cloud of dust and gas that continued to shrink upon itself by its own gravitational forces. This caused it to undergo the fusion process and give off light, heat and other radiation. During this process, the remaining clouds of gas and dust that surrounded the sun began to form into smaller lumps called planetesimals, which eventually formed into the planets we know today.


The Earth went through a period of catastrophic and intense formation during its earliest beginnings about 4.5 - 4.6 billion years ago. By 3.8 to 4.1 billion years ago, Earth had become a planet with an atmosphere (not like our atmosphere today!) and an ocean. This period of time of Earth's formation is referred to as the pre-Cambrian Period. The pre-Cambrian is divided into three parts: the Hadean, Archean and Proterozoic Periods.





Pre-Cambrian Period





The Earth formed under so much heat and pressure that it formed as a molten planet. For nearly the first billion years of its formation -- called the Hadean Period (or "hellish" period) -- Earth was bombarded continuously by the remnants of the dust and debris -- like asteroids, meteors and comets -- until it formed into a solid sphere, fell into an orbit around the sun, and began to cool down.





As Earth began to take solid form, it had no free oxygen in its atmosphere. It was so hot that the water droplets in its atmosphere could not settle to form surface water or ice. Its atmosphere was also so poisonous that nothing would have been able to survive.


Earth's atmosphere was formed mostly from the outgassing of such volatile compounds as water vapor, carbon monoxide, methane, ammonia, nitrogen, carbon dioxide, nitrogen, hydrochloric acid and sulfur produced by the constant volcanic eruptions that besieged the Earth. It had no free oxygen.





About 4.1 billion years ago, the Earth's surface -- or crust -- began to cool and stabilize, creating the solid surface with its rocky terrain. Clouds formed as the Earth began to cool, producing enormous volumes of rain water that formed the oceans. For the next 1.3 billion years (3.8 to 2.5 billion years ago), called the Archean Period, first life began to appear (at least as far as our fossil records tell us... there may have been life before this!) and the world's land masses began to form. Earth's initial life forms were bacteria which could survive in the highly toxic atmosphere that existed during this time. In fact, all life was bacteria during the Archean Period.





Toward the end of the of the Archean Period and at the beginning of the Proterozoic Period, about 2.5 billion years ago, oxygen-forming photosynthesis began to occur. The first fossils, in fact, were a type of blue-green algae that could photosynthesize.





Some of the most exciting events in Earth's history and life occurred during this time which spanned about two billion years until about 550 million years ago. The continents began to form and stabilize, creating the supercontinent Rodinia about 1.1 billion years ago. (Rodinia is widely accepted as the first supercontinent, but there were probably others before it.) Although Rodinia is composed of some of the same land fragments as the more popular supercontinent, Pangea, they are two different supercontinents. Pangea formed some 225 million years ago and would evolve into the seven continents we know today.


Free oxygen began to build up around the middle of the Proterozoic Period -- around 1.8 billion years ago -- and made way for the emergence of life as we know it today. This event, of course, created conditions that would not allow most of the existing life to survive and thus made way for the more oxygen dependent life forms.





By the end of the Proterozoic Period, Earth was well along in its evolutionary processes leading to our current period, the Holocene Period, also known as the Age of Man. Thus, about 550 million years ago, the Cambrian Period began. During this period, life "exploded," developing almost all of the major groups of plants and animals in a relatively short time. It ended with the massive extinction of most of the existing species about 500 million years ago, making room for the future appearance and evolution of new plant and animal species.





... and then, about 498 million years later -- 2.2 million years ago -- the first modern human species emerged.
Reply:Mato has just given you as good an answer as you could get in 200 words or less. Bacteria are highly evolved compared to the first humble molecular self-replicators in their lipid bubbles. Brenda, the world is not as simple as the first two pages of Genesis. One has to do some serious reading in order to understand these things.
Reply:Evolution does not explain the first life forms or the creation of the universe. There is a need for a creator and an intelligent design at least at the molecular level.
Reply:If there is proof that bateria was created before humans =I would be pleased to know.
Reply:It was ALWAYS THERE. Just like religious people say that God was always there.

fuchsia