Respuesta :

Around the mid 1800s the theory of evolution became threatening to the theory that species were unchanging fixtures of nature. The theory he challenged was the fixity of species.

Answer:

The theory of FIXITY OF SPECIES

Explanation:

The theory of fixity of species was a theory proposed  which states that all species remained on changed throughout history.

This theory was strongly rejected and opposed by the Evolution theory which believes the evolvement of species overtime in history. Charles Darwin was among the first scientist who strongly opposed/challenged this theory with his new evolutionary theory which was explained in details in Darwin's origin of species in 1859. other scientist who discarded the theory of fixity of species includes Alfred Russel Wallace, Aristotle and Lamarck.

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