Life on Earth and the possibilities of extraterrestrial life in our solar system

2. Explain the theories for the genesis of life.

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.

The origin of Life - science.jrank.org/

3. Explain the theory of natural selection.

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 showed that some animals within a species had varied traits making some more suited for certain