The wing needs to be light and rigid. A skin stretched over a framework does the job well. Feathers help to create an efficient wing profile, though for small and slow animals like insects the profile is not so important. Progress in science is often made by finding relationships between different things. The last thirty years have seen a tendency for inter-disciplinary research which is in contrast to the extreme specialisation that research so often demands.
Many people believe in the unity of the world.
This cannot be done for several reasons. One is that at each level, the type of organisation can be, and is, very different. Exponential and Sine - Marriage of Opposites At school or at college you may learn that the exponential function and the sine and cosine functions are closely related. They are related by the fact that they are both special cases of a more universal mathematical function. The connection is only revealed if we use the so-called imaginary numbers.