Answer:
The correct answer is option D. "The earth and its organisms have changed through time".
Step-by-step explanation:
Charles Darwin's theory of evolution by natural selection, introduced the concept of adaptation to explain the origin of the species. An early realization that gave rise of this theory is that the Earth and its organisms have changed through time. There was no logical explanation to the changes within the organisms and the Earth, but it was known that they changed previous to Darwin's theory.