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All life, including human, could be viewed as bags sea water containing the same mineral constituency as the ocean together with a dynamic dispersion of molecules that perform the biological processes that constitute life.
In all living cells - proteins answer for both form and function.
Proteins are the active elements of cells that aid and control the chemical reactions that make the cell work. They control the processes by which proteins are made from the instructions in the genes.
Sequence comparisons of proteins thousands of different prokaryotes, together with assumptions of the slow mutation rate of prokaryotes lead to estimates that major classes of primitive microbes (chemotrophs and photosynthetic autotrophs) fused together more than 2.5 billion years ago in a process called endosymbiosis.
This endosymbiosis, or symbiotic merging of two cells, enabled the evolution of a highly stable and successful organisms with the capacity to use energy from sunlight through photosynthesis.
They produced the oldest fossils that date to about 3500 mya, and are known as bacterial microfossils.
Discovered in the 1970s in western Australia, these earliest fossils express what appear to be chemical signs of delicate chains of microbes that appear exactly like living blue-green algae (otherwise known as cyanobacteria).
For billions of years, these bacteria formed extensive slimy carpets in shallow coastal waters, and before the end of Achaean-time 2.5 bya had also formed a thin crust on land.
Known as increasingly abundant during the Archaean, a fact of critical importance to the later evolution of life.The most prevalent theory is that the Eubacteria are ancestral to the Archaea, only identified as a distinct domain of life in the 1970's.Domain Archaea include organisms that can exist, and maybe are the only organisms that can exist, in extremely hostile environments, such as thermal vents and hypersaline water.It was some 4 billion years afterwards, with some exceptions, that animals first left their mark in the fossil record.But it was during this Precambrian period when profound events occurred, leading ultimately to "life" as we know it today.While science generally can not determine the producing organism or organisms, stromatolite can indeed be beautiful expressions of the most ancient life on earth.