The answer to the problem of ecological migration

It can be seen from the map (1) that among various factors affecting population migration, economic factors account for 56.2% of the migrated population. Among them, the proportion of migrant workers and businessmen is the highest, and the main reason for the large-scale population migration during this period is the difference in economic development level between regions. (2) Other reasons for population migration include ecological migration and national policies. (3) In all population migration caused by economic reasons, in terms of gender, the number of women exceeds that of men in family migration.

So the answer is: (1) 56.2%; Work and business; Differences in the level of economic development between regions; (2) Ecological migration; National policies; (3) male; Female; ? Female; Male.