Will advanced organisms be the same as complex organisms? Why?

Complexity in body design evolves because of necessity to adapt according to the changing environment. Hence, a complex organism would be an advanced one; in comparison to a simple organism.

Complexity in body design evolves because of necessity to adapt according to the changing environment. Hence, a complex organism would be an advanced one; in comparison to a simple organism.

Advanced organisms as well as complex organisms both are of same type. Because they both do not have simple body structure.

Yes, The complex organisms are comaratively more advanced as compound to simple organisms. It is because the complexity of organisms has increased over evolutionary time.