Which of the following would be considered homologous structures? 1. all of these are homologous structures. 2. none of these 3. the arm of a koala and the tentacle of a nautilus 4. the flipper of a dolphin and the tentacle of a nautilus 5. the flipper of a dolphin and the arm of a koala

Answer;

5. the flipper of a dolphin and the arm of a koala

Explanation;

Homologous structures are body structures that share a common origin, the degree at which these structures resemble each other can be used to infer the closeness of evolutionary relatedness.

-A homologous structure is an example of an organ or bone that appears in different animals, underlining anatomical commonalities demonstrating descent from a common ancestor. It's when very different animals have bones that appear very similar in form or function and seem to be related. For  example; the flipper of a dolphin and the arm of a koala.

i believe the answer is a or 1