In Darwin's time biologist were arguing that life changed in a process of evolution. Some of the evidence for changing life came from fossils which are the preserved traces of ancient organisms.
What is evolution?
Evolution is any change in the characteristics of a species over many generations and depends on the process of natural selection.
The theory of evolution is based on the idea that all species are related to each other and slowly change over time.
Thus, in Darwin's time, biologists were arguing that life changed in a process of evolution.
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