Although insect wings are constructed differently than bird wings, they do share a similar overall shape. why?

These wings share a similar shape due to a process known as convergent evolution. The wings, in this case, are analogous structures that developed independently from one another (aka they do not share a recent common ancestor), but the organisms adapted to a common environment. Simply put, their similar problems lead to similar solutions.

The answer is texture

Ithink you should go back and learn in school rather then here asking questions