Question

which of the following structures is an example of homologous structures? a. the fins of a fish and the wings of a bat b. the eyes of an octopus and the eyes of a human c. the wings of a butterfly and the wings of a bird d. the flippers of a dolphin and the arms of a human what defines analogous structures in comparative anatomy? a. similar structures with the same functions and origins b. no evolutionary significance in organisms c. different functions in different organisms with the same origin d. similar functions in different organisms but different origins what is a limitation of fossil records in understanding evolution? a. fossilization occurs frequently. b. soft - bodied organisms are well - preserved. c. they offer a continuous evolutionary timeline. d. they provide incomplete records.

Explanation:

1. Homologous structures have a common evolutionary origin but may have different functions. The flippers of a dolphin and the arms of a human are both derived from the fore - limb structure of a common ancestor, making them homologous. The fins of a fish and wings of a bat, eyes of an octopus and human, wings of a butterfly and bird are examples of analogous structures (similar function, different origin).
2. Analogous structures in comparative anatomy are defined as having similar functions in different organisms but different origins. This is due to convergent evolution where different species evolve similar traits to adapt to similar environments.
3. A major limitation of fossil records in understanding evolution is that they provide incomplete records. Fossilization is a rare event, soft - bodied organisms are rarely preserved, and the fossil record has gaps, not offering a continuous evolutionary timeline.

Answer:

1. d. The flippers of a dolphin and the arms of a human
2. d. Similar functions in different organisms but different origins
3. d. They provide incomplete records