Chapter 3 Migration TRUE/FALSE. Write 'T' if the statement is true and 'F' if the statement is false. 1) The difference between the number of people migrating to a place and the number leaving is called net migration. Answer: TRUE Diff: 1 2) The three major kinds of push factors are political, economic, and environmental. Answer: TRUE Diff: 1 3) The most common environmental threat to people comes from too much or too little water. Answer: TRUE Diff: 2 4) Most migration occurs because of a combination of push and pull factors. Answer: TRUE Diff: 2 5) In recent years, the immigration quota has been sufficient to accommodate all people who wish to migrate to the United States. Answer: FALSE Diff: 2