Final answer:
Charles Darwin was unable to provide evidence from genetics, paleogenetics, and the extensive fossil record with transitional forms because these disciplines were undeveloped or not yet existent during his time.
Step-by-step explanation:
The three fields from which Charles Darwin was unable to provide evidence include genetics, paleogenetics, and detailed fossil records with transitional forms. At the time of Darwin, the knowledge of these fields was either non-existent or very limited. Specifically, Darwin did not know about genes or how traits were inherited and passed from parents to offspring, preventing him from understanding the mechanism of inheritance and variation that is widespread in organisms. Additionally, the fossil record was not as comprehensive as it is today, leaving Darwin without the ample fossil evidence that could further support his theory of evolution by natural selection. Lastly, the field of paleogenetics, which involves the study of past genetic material, was not accessible in Darwin's time, leaving a gap in evidence for the exact genetic changes over time in organisms.