How has a ancient bow and arrow changed into a modern bow and arrow?
The ancient people made the bow and arrows. The bow and the arrows are changing because of the people or inventor that wants to improve it. They created bowgun,the bow that using in archering etc.
Derived from the history of archery (linked below) it seems that all people have, at some point in time, used a bow and arrow with few exceptions; ancient peoples in Australia and some in the pacific islands are not noted to have used the bow and arrow (although they did have another type of spear (arrow) that was thrown by a type of amplification (bow)).