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When earth first was formed, its environment was hostile-at least compared to todays environment. The beginnings of life didn't happen until millions of years after earth was first form, and began to cool. There are 4 stages to how life began to form; 1) Abiotic Synthesis- there were a bunch of little molecule that make up cells in the ecosystem of early earth that came from meteorites and volcanic eruptions. With a warm atmosphere, these molecules were colliding with each other very frequently, and eventually bonded to eachother forming the basic building blocks-called monomers- for protein, DNA and other organic molecules (carbon/hydrogen based) 2)Combination of Organic Monomers- these mini-molecules then spontaneously began to form macromolecules and the basic structures of life. 3) Protocells- these macromolecules were then held within self-sufficient sacs that promoted the growth and development them. 4) Reproduction- these cells then began to reproduce and become more complex. Reproduction sparked the beginning of hereditary patterns which was the beginning of cellular evolution-the basis of biology.
Contributed by Katherine Battey