Because we humans are made from zygote which is formed by a combination of two haploid gametes !!
When the sperm and ova meet there is a crossing over type phenomenon which decides what will be the phenotype !! so we somewhere distinct from both our parents !!
The supreme crowe is up down left and right and anywhere in sight
The answer is : The crusades.
The Crusades were a series of religious wars between Christians and Muslims started primarily to secure control of holy sites considered sacred by both groups. In all, eight major Crusade expeditions — varying in size, strength and degree of success — occurred between 1096 and 1291.