Abstract
Life forms originated from the sea, and it is thought that they probably came from deep in the ocean at hydrothermal vents. Life forms started from the generation of small organic compounds, such as amino acids, and then self-replicable nucleic acid, RNA, until finally DNA emerged. The most critical event for life was the compartmentalization of these replicable units by lipid membrane. Starting from these protocells, cells underwent functional evolution; symbiosis, and multicellularization. Marine organisms became diversified, as seen in the Cambrian explosion, but have retained the basic cellular mechanisms from ancient unicellular organisms into more complicated multicellular organisms.
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Inaba, K. (2020). Marine Organisms and Life Science. In: Inaba, K., Hall-Spencer, J. (eds) Japanese Marine Life. Springer, Singapore. https://doi.org/10.1007/978-981-15-1326-8_8
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DOI: https://doi.org/10.1007/978-981-15-1326-8_8
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