Any change in the structure or function of an organism which makes it better suited to its environment. For example, the torpedo body shape of a tuna allows for fast swimming in the open ocean.
Nayiphi inguqulelo kulwakhiwo okanye ekusebenzeni kwento ephilayo ebangela ukuba ifaneleke ngcono kokuyingqongileyo. Umzekelo, ubume obumile okwenqanawa yemfazwe ende enesantya sentlanzi enkulu yolwandle evumela ukudada ngesantya esiphezulu kulwandle oluvulekileyo.