Mendel; Darwin In the 1700s, ____ classified organisms by their morphological similarities and differences, and in the 1800s, ____ provided the scientific rationale for the heritable basis of these morphological variations.

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Linnaeus, in the 1700s, classified organisms based on their morphological similarities and differences, establishing a formal system of naming, ranking, and classifying organisms that is still in use today. Darwin, in the 1800s, provided the scientific rationale for the heritable basis of these morphological variations through his theory of natural selection, explaining how species evolve over time.

Mendel; Darwin in the 1700s, ____ Classified Organisms by Their