Final answer:
Biological classification is hierarchical and based on different levels of similarity in physical features, reproduction, and molecular sequences. Molecular biology and DNA technology have allowed scientists to compare organisms based on DNA sequences for more accurate classification and tracing of ancestry.
Step-by-step explanation:
The process of classifying organisms in biology is hierarchical and based on different levels of similarity in physical features, methods of reproduction, and molecular sequences. This means that organisms that are more similar are grouped together at higher levels of classification, such as phylum, class, order, family, genus, and species. The advancement of molecular biology and DNA technology has allowed scientists to compare organisms based on the similarities in their DNA sequences, which reflect their evolutionary lineage. Molecular data provides not only more characteristics to compare but also characteristics that are unlikely to be selected for by natural selection, making it a valuable tool in tracing ancestry.