Darwin used Multiple lines of evidence to support the theory of evolution by natural selection they are fossil evidence, biographical evidence and anatomical evidence.
Step-by-step explanation:
The Multiple types of evidences supports the theory of evolution. The homologous structures provides the evidence for common ancestry and the analogous structures describes that similar selective pressures can produce similar adaptions.
Evolution by natural selection is one of the good method in theory of history of science and it is supported by evidence from wide variety of scientific disciplines.
The comparative sequence analysis method is used to examine the relationship between the DNA sequences of different species. This evolutionary relationships are used in the study of diseases like HIV.