In the process of evolution of mankind, humans have been storing and transmitting knowledge through which of the following means?
i. conversation
ii. songs
iii. elaborate lectures

i, ii, iii

Think of one factor that has made a great difference in the evolution of mankind. Perhaps it is man’s capacity to store and transmit knowledge which he has been doing through conversation, through songs and through elaborate lectures. But man soon found out that we need a good deal of training and skill to do things efficiently. Tthe labour skill of an educated person is more than that of an uneducated person and hence the former is able to generate more income than the latter and his contribution to economic growth is, consequently, more.