Which of the following clues to change in organic structure over time were not known or noted prior to Darwin?

Question

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Prior to Darwin, the concept of a mechanism to explain change in organic structure over time (such as natural selection) was not known or widely accepted. However, cross-species structural similarities, cross-species embryological similarities, and apparent function of traits were all observed and noted prior to Darwin's work.

Which of the Following Clues to Change in Organic Structure