Question

scientists today can use many investigative methods to study evolution. which method was developed after darwins time?
dna comparisons
observations
comparison of fossils
experimentation

Explanation:

Darwin lived in the 19th century. DNA was discovered in 1869, but the structure of DNA (double - helix) was discovered in 1953. DNA comparisons as a method to study evolution rely on the understanding of DNA structure and function which came long after Darwin's time (1809 - 1882). Observations, comparison of fossils, and experimentation were methods that were used or at least conceptually available in Darwin's time. Observations were a key part of Darwin's own work (e.g., observing finches in the Galapagos). Comparison of fossils was a method used by geologists before Darwin. Experimentation (in a basic sense, like breeding experiments) was also possible in Darwin's era.

Answer:

DNA comparisons