Assertion: Initially, the means of communication were also the means of transportation.
Reasoning: Development in the field of science and technology has significantly contributed to bringing about a revolution in the field of communication.

Both Assertion (A) and reasoning (R) are correct, but R is not the correct explanation of A.

Human beings have evolved different methods of communication over time. In earlier times, the messages were delivered by beating the drum or hollow tree trunks, giving indications through smoke or fire or with the help of fast runners. Horses, camels, dogs, birds and other animals were also used to send messages. Initially, the means of communication were also the means of transportation. The invention of the postoffice, the telegraph, the printing press, the telephone, the satellite, etc has made communication much faster and easier. Development in the field of science and technology has significantly contributed to bringing about a revolution in the field of communication.