_____ structures probably indicate descent from a common ancestor with modifications for different functions.
A) Homologous
B) Analogous
C) Vestigial
D) Derived
E) Primitive

Question

Quizplus · Accepted Answer

Homologous structures are similar structures found in different organisms that are believed to have descended from a common ancestor. These structures may have undergone modifications over time, adapting to different functions or environments, but they share a common underlying structure and developmental pathway. Therefore, they likely indicate descent from a common ancestor with modifications for different functions. Analogous structures, on the other hand, are similar structures that have evolved independently in different organisms to serve the same function, such as bird wings and insect wings, and do not necessarily indicate a common ancestry. Vestigial structures are body parts that have lost their original function over time and are often reduced in size and complexity, such as the human appendix. Derived and primitive structures refer to the evolutionary history of a trait, with derived traits being those that have arisen more recently and primitive traits being those that have a longer evolutionary history.

_____ Structures Probably Indicate Descent from a Common Ancestor with Modifications