The research has implications for a wide array of crops, especially for staples grown in the developing world, where sufficient sources of protein are sometimes limited. (sciencedaily.com)
Dairy products do contain trace amounts of zinc, however, more sufficient sources include seafood, fish, poultry. (foodpyramid.com)
If you don't have sufficient source when you write your essay, you will stop writing your essay as soon as you start writing your paper because of lack of ideas. (essayschief.com)