
A serious obstacle to evolutionary theory is the interdependent relationships between living things, called symbiosis, in which completely different forms of life depend on each other to exist. Darwin’s theory of biological change was based on competition, or survival of the fittest, among the individuals making up a species. He admitted: ‘If it could be proved that any part of the structure of any one species had been formed for the exclusive good of another species, it would annihilate my theory, for such could not have been produced through natural selection’.
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