There have been many theories about the origin of life on Earth. One early theory was spontaneous generation, which stated that living things could arise from non-living matter, but this has been disproven through experiments. Charles Darwin proposed that spontaneous generation occurred once to create the first organism, and then evolution led to the diversity of life, though some believe the bubble theory that early life arose from organic-filled bubbles rising in the oceans. While Darwin's theory is simpler, the bubble theory provides a more detailed explanation supported by known conditions. Understanding all theories is important to determining how life truly first developed.

1. Alternate Life Theories
There have been many arguments about how and when animals and life organisms first
appeared on planet Earth; some dating back to medieval times. With these different theories, many
people aren’t sure which one is closest to the truth. Both Spontaneous Generation and the Bubble
Theory are theories that have to do with this problem; with much research, I have come to a consensus
that the Bubble theory is much more likely.
One of the earliest and most believed theory was created in medieval times: Spontaneous
generation. This theory states that when there is a pile of garbage or any other type of rotting material,
the nutrients can create a sudden appearance of certain animals, such as insects, amphibians and mice.
Since most scientists didn’t conduct experiments at that time, this theory seemed very logical to most
people at the time.
Since they did not do many experiments, many scientists came up with some different instances
that made their theory seem believable — many of these that we can easily contradict now. For
example, when the Nile River flooded, there was always a lot of mud that contained a lot of different
nutrients. Many frogs lived in this mud, so it seemed as if they appeared out of nowhere. Also, back
then, cities were very dirty and unsanitary, so people just threw their garbage out the window. All of this
rotting trash made a very nice home for different critters, making it seem like mice and rodents would
just pop out of the garbage.
We now know that these different examples can be proved wrong easily, but that is due to two
scientists from the earlier centuries: Francesco Redi and Louis Pasteur. Redi didn’t believe that this
theory made much sense, so he conducted an experiment with flies. Since flies were one of the animals
that were believed to be able to appear out of nowhere, he tried to prove that wrong by showing that
flies are able to reproduce by laying eggs. Pasteur also didn’t believe that Spontaneous Generation was
possible, so he also conducted an experiment; he put different nutrients in two containers – one that
did contain air and one that didn’t – when there wasn’t any life that appeared in either of them, he
stated that Spontaneous Generation couldn’t be possible.
Finding out that the theory they always believed was wrong, many people were very confused. The main
question being asked by them was, If Spontaneous Generation isn’t possible, how did we get the first life
organism? All over the world, scientist were out to answer that question, but Charles Darwin’s theory
was accepted by the most people. He believed that Spontaneous Generation was possible, but that it
only happened once, a very long time ago. After this, he thought different animals were able to evolve
from this one life organism.

2. After stating this theory, the world’s scientists were trying to see if this theory really could have
worked. One thought that helped prove that this theory really was believable was that if there was only
one organism to start out with, there wouldn’t have been any competition for food or water. Some
scientists still didn’t believe that Spontaneous Generation wasn’t possible, but Darwin’s evolution theory
was. Others argued that without it, the evolution theory wouldn’t be possible.
Numerous people are starting to believe Darwin’s theories with more and more research. Even
though it may seem like the only possible idea, there are many other theories that have been created.
One of the most believable of the others is the bubble theory; it states that there were bubbles in the
oceans full of aerosol, atmospheric counterparts and precipitation droplets. They were created from
organic material that was put into the sea, and slowly concentrated into bubbles. When they rose to the
top of the water and burst, they contained life cells.
Both Darwin’s theory and the Bubble theory have something to do with the amount of nutrients
in an object that work together to create a life cell or an animal. To many people, Darwin’s theory seems
more possible because it is simpler to understand, but when you look at the facts, the Bubble theory
seems more realistic. First of all, they know almost exactly what type of gases and nutrients were in the
bubbles and are able to thoroughly explain what they thought happened. While with Darwin’s theory, it
seems too simple to happened the way scientists explain it.
With more and more research, it has become clear which theories make sense and which do
not. Though it may seem easier to take the easy way out and go with the less complicated theory, doing
so will only deprive you of being able to see the others and their true potential. To truly understand the
universe and its different life forms, one must understand all the theories and be able to pick out the
most logical of them.