Naturalists represent the idea that only natural laws (physical laws) are the rules that govern the structure and behavior of the natural universe. This means that everything can be explained in terms of natural causes. Naturalism is the belief that all that exists material matter, that there is no such thing as soul and that individuals have no purpose in life.
A non polar compound hope this helps
In terms of function, bird wings are used to flap transversely, whereas butterfly wings are used to flap laterally. In terms of structure, bird wings are filled with hollow bones for easier flight, whereas butterfly wings are structured by scales and tiny hairs.
