What is the current greatest threat to agricultural sustainability?
a.
erosion
b.
water pollution
c.
air quality
d.
all of the above
ps it is for sure not d.

request for reexamination

answer: 20 percent

the fish culture has become a developing commercial practice in developing countries which is already prominent in developed countries of the world. the major fish protein demand is being supplemented in developing countries is   fishing to meet the needs of the growing population. therefore, in some developing nations, the percentage of animal protein from fish in the diet can be as high as 20 percent.