What role does DNA play in understanding homologous structures, and how is it used to support the Theory of evolution?

Homologous structures provide evidence for common ancestry, while analogous structures show that similar selective pressures can produce similar adaptations (beneficial features). Similarities and differences among biological molecules (e.g., in the DNA sequence of genes) can be used to determine species' relatedness.

Explanation: I took biology virtually.

Biologists often compare the sequences of related genes. If two species have the similar gene, it is because they inherited it from a common ancestor. In general, the more the DNA differences in homologous genes between two species, the more distantly the species are related.

Because there are tens of thousands of genes in humans and other organisms, DNA contains a tremendous amount of information about the evolutionary history of each organism. It determines evolutionary relationships among organisms, and it indicates the time in the past when species started to diverge from one another.

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements