Evolution is still classified as a theory because; It is speculative and not generally accepted ( i.e. it is used to explain the pre-existence of man based on general principles ) .
A theory is set of well thought out explanations for natural occurrences in nature backed by several scientific methods. It is very much speculative because previous occurrences are explained using a theory and not future or present occurrences.
Therefore even with the amount of research and evidence available through scientific methods evolution is still a theory because it cannot be used to explain the present or future existence of man.
Hence evolution is still classified as a theory because; It is speculative ( i.e. it is used to explain the pre-existence of man based on general principles ).
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