So, I don't want to write this for you (in fact, I'm pretty sure I'm not allowed to) since I can't exactly identify your personal experiences with American culture. But, I can give you some pointers for this narrative to base you writing on.
It helps to know exactly what the staples of American culture are. Basically, think of all of the things that makes America, America. What does the American experience mean to you? Is it the freedom to practice your religion, or have the ability to express yourself in the (legal) ways you choose? Is it the ability to enter and end relationships and marry whoever you want in the eyes of the law? Is it our diverse and multilingual nature? Is it the food that people first think of when they hear "Do you want American food for dinner?" Is it the artistic aspect of living here, where art museums, ability to major in art and writing, and general exposure to art and writing is common? Is it the prominence of music in our modern society? Is it the sports that bind the people of the nation together? Is it the (only sort-of limited) ability for LGBT people to live fearlessly in the eyes of the law and nation as a whole, with communities and help they can look to in their times of need?
What defines the experience for you? What's important to you as an American? That's what they're trying to get at with this assignment. Feel free to explore topics of American culture that go beyond the ones I have listed here, since there must be many more.
Hope this helped you out! Feel free to ask me any additional questions if you have any. :-)
The BOD5 takes into consideration the difference between the initial DO and the final DO divided by the fraction of the sample tested in a 300 mL BOD flask. The problem states that the sample was directly placed in a BOD bottle so we assume that the volume used was 300 mL of the water sample. The fraction of water is 1 (300/300).
