Question: Using your understanding of the 4 macromolecules explain how Earth’s early atmosphere and the 4 molecules taught could lead to the formation of life on Earth. Using your understanding of the 4 macromolecules justify the scientific theory of how life began on Earth. Include a timeline of which macromolecules formed first. Provide scientific evidence, chemical properties of the atoms found in the Earth’s early atmosphere, atoms found in the macromolecules, to support your timeline.

Scientists believe that the Earth was formed about 4.5 billion years ago. Its early atmosphere was probably formed from the gases given out by volcanoes. ... The early atmosphere was probably mostly carbon dioxide, with little or no oxygen. There were smaller proportions of water vapour, ammonia and methane.

Scientists think that lightning sparked chemical reactions in Earth's early atmosphere. The early atmosphere contained gases such as ammonia, methane, water vapor, and carbon dioxide. Scientists hypothesize that this created a “soup” of organic molecules from inorganic chemicals.

The Oparin-Haldane hypothesis suggests that life arose gradually from inorganic molecules, with “building blocks” like amino acids forming first and then combining to make complex polymers.

The Miller-Urey experiment provided the first evidence that organic molecules needed for life could be formed from inorganic components.

Some scientists support the RNA world hypothesis, which suggests that the first life was self-replicating RNA. Others favor the metabolism-first hypothesis, placing metabolic networks before DNA or RNA.

Simple organic compounds might have come to early Earth on meteorites.

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