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Fossils are the preserved remains or traces of organisms.Since there is no unequivocal definition of life, most current definitions in biology are descriptive.Virus self-assembly within host cells has implications for the study of the origin of life, as it may support the hypothesis that life could have started as self-assembling organic molecules.In more detail, according to physicists such as John Bernal, Erwin Schrödinger, Eugene Wigner, and John Avery, life is a member of the class of phenomena that are open or continuous systems able to decrease their internal entropy at the expense of substances or free energy taken in from the environment and subsequently rejected in a degraded form.Aristotle was the first person to classify organisms.
Variations of this definition include Stuart Kauffman's definition as an autonomous agent or a multi-agent system capable of reproducing itself or themselves, and of completing at least one thermodynamic work cycle.
There are two kinds of cells, prokaryotic and eukaryotic, both of which consist of cytoplasm enclosed within a membrane and contain many biomolecules such as proteins and nucleic acids.
Cells reproduce through a process of cell division, in which the parent cell divides into two or more daughter cells.
and replicate by creating multiple copies of themselves through self-assembly.
However, viruses do not metabolize and they require a host cell to make new products.