Aquifers are a. located below the water table b. important sources of freshwater c. located in the saturated zone d. all of the above

d. all of the above, they are all true

The correct answer is d. all of the above.

An aquifer is an underground layer of sedimentary rock such as sandstone which bears water. Underground layer of water-bearing rock.  Water from rainfall and melting of snow percolates in the ground to fill aquifers. Thus, they are the storehouse of the underground water and is an important source freshwater. The top water level of aquifers are water table.  Water from aquifers used for drinking, agriculture and various industrial purposes.

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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.