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. In other words, it's when very different animals have bones that appear very similar in form or function and seem to be related.
Perch have paired pectoral and pelvic fins, and two dorsal fins, the first one spiny and the second soft. These two fins can be separate or joined.
<span>I think it would make things unbalanced, The things they hunted would mass produce and cause havoc. The circle of life reigns true i believe with all living and breathing things. I wish humans would mind their own, and not be greedy. Live and let die</span>
Cell, tissue, organ and organ system