• The total number of people residing in a country at a specified period of time is called the size of population of that country.
• The growth of population is determined by the birth rate, death rate and migration of people.
• The process of society’s transformation from rural to urban is known as urbanization.
• Communication is classified into the personal and mass communications.
• Trade is an exchange of goods and services. Internal and International trades are its types.Import and exports are the components of an International Trade.