Different climates and different conditions produced many different in various groups of the Aryans. Each group went on changing in it own way with new habits and customs. It could not meet the other groups in the other countries as it was cut off from the others. If the people of one country learnt something new, they could not tell it to the people of another country. So, changes came in and after some generations, the one Aryan family became split up into many. Perhaps they even forgot that they all belonged to one large family. Their one languages, which seemed to differ greatly from each other.