After darwin proposed his ideas about natural selection as a mechanism for evolution, it took time before evolution was generally considered a theory. why do we now refer to it as a theory

Questions still remain concerning its validity, so it must be called a theory.

Explanation:

We refer to it now as a theory because it has factual support that can incorporate laws, inferences, and tested hypotheses. It is not yet widely accepted enough to become the law of nature, due to other belief systems such as Buddhism, Christianity, and the like. 

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Explanation: