Search of Extraterrestrial Life Paper

Topics: Life, Evolution, Natural selection Pages: 5 (1616 words) Published: February 21, 2010
SCI 151 Research Paper

Search of Extraterrestrial Life Team Paper
The earth has been a harbor of life that dates back for many years, like a mother carrying a baby in her womb, like that mother the Earth provides us with protection from the worlds (materials, gases, and other elements that have the potential to harm us) with a well balanced combination of its own. Life on earth has been considered mysteries in so many ways for so long .And the truth is because we have no way of talking to someone that existed in that time we had no idea. But fortunately through study of the earth and its fossils left behind it can tells us what it wants us to know . Like some fossils recorded where believed to be of a worm like organisms (metazoan) dated back some 680 million years ago. And over the next few million years or so through the extinction of species and earths evolution, we still remain. The Earth is a world of life in itself; it provides all that constitutes life as we know it. The Earth seems to know what we need for life, like oxygen and hydrogen elements that play an important role for all living creatures in some way. The allowances of light, air, water, and food are some of the key factors in maintaining life. From the trees, to the animals, to human beings we must all depend on the necessities of life in which the earth provides for us. For example at an early age we are taught to distinguish humans have lungs, and fish have gills, some amphibian break through pores from their moist skin. No matter how the animal is designed and

SCI 151 Research Paper

how it evolved throughout the years we still have a common dependent on the earth to allow us to breath, receive nutrients, and reproduce. There are many cultures and religions explaining their version of the theories for the genesis of life. Back in Medieval times some Europeans believed that small creatures appeared without apparent external cause or reason from garbage or old clothes. An Italian physician named Francesco Redi proved this belief to be wrong. He proved that maggots came from flies that laid their eggs, rather than appearing without apparent external cause from garbage or old clothes. Genesis of life came from sunlight. An experiment was conducted by a student of Physics testing energy for rearranging atoms and molecules into organic forms. The student Stanley Miller filled a closed glass container with a mixture of gases. A reservoir of boiling water was at the bottom and above it was an apparatus that caused sparks to pass through the gas mixture. Amino acids and other organic chemicals formed from the gases and water. Since then, there has been other more sophisticated research has been conducted synthesizing additional amino acids and even nucleic acids. These molecules organize into DNA and RNA encoding the genetic information of organisms.

There was a time when scientist believed that species developed gradually from one form to another but had no validity to make it happen. The theory of natural selection provides that method of evolution. The basic idea of natural selection is based on those organisms that are best suited to the new circumstances thrive and others will not. An observation by Charles Darwin

SCI 151 Research Paper

showed that some animals within a species had varied traits making some more suited for certain conditions. The theory showed that over time the better suited animals would thrive and the others that weren’t would die off completely. Over time the better trait would dominate and then become a totally different creative like a fish becoming a frog. Although there is no doubt that variations within a single species are better suited to handle different situations. There has been some concern about the meaning of the natural selection. An example is the story about light and dark colored moths. The dark color moths found it easier to survive...
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