Final answer:
The best support for Darwin's concept of descent with modification comes from fossil records, embryology, homologous structures, and molecular biology.
Step-by-step explanation:
The best support for Darwin's concept of descent with modification comes from the four types of data: fossil records, embryology, homologous structures, and molecular biology.
Fossil records provide evidence of extinct species and show the progression of life forms over time. Embryology reveals similarities in early developmental stages among different species, suggesting a common ancestor. Homologous structures are physical features shared by related organisms, indicating a common evolutionary origin. Lastly, molecular biology looks at DNA and genetic sequences to compare similarities and differences among species.