Which term is used for the study of how form relates to function and evolutionary history across species?

• A. Adaptation
• B. Comparative anatomy
• C. Evolution
• D. Natural selection

Answer: (B)

Comparative anatomy focuses on how form relates to function and evolutionary history across species. By examining and comparing the shapes, structures, and arrangements of body parts in different organisms, this field reveals how certain features enable specific functions and how those features have been shaped by evolution. It highlights homologous structures that reflect common ancestry—like the bone pattern in the forelimbs of humans, cats, whales, and bats—showing deep evolutionary links even when functions differ. It also notes analogous structures, where similar functions have evolved separately in response to similar needs, illustrating how similar pressures can produce comparable solutions. This approach directly ties morphology to both utility and lineage, which is why it best fits the description. The other terms refer to processes or mechanisms (how traits change, why they change, or the mechanism driving change) rather than the study of cross-species form–function relationships.