From 1930 to 1939 fire ants spread inland about 60 miles from their point of introduction in mobile, alabama. what was the cause of their spread over this distance?
a. a natural spread
b. airplanesbeing transported along with soilbeing
c. transported along with plantsdispersion
d. via ship ballast

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.