3. Scientists monitor the nitrate levels in a stream where the water shed is mature forest. They find an average of 2 mg/L of nitrate in the stream over a six-month period. Scientists cut down the trees in

the watershed and test the stream for nitrogen for the next six months. The average nitrate in the

stream rises to 18 mg/L.

Calculate the percent difference between the stream with the forest intact and the same stream

after the forest is removed.

Calculate the percent change in the nitrate level of the stream after the trees are removed.

Lunches in us high schools are lacking adequate nutritional value. the menus have become increasingly varied over the past two decades, and they are varied to a fault. now high school students can choose between healthy main dishes and "junk food" items offered à la carte on the school menu. milkshakes and fries are often the lunch of choice for america’s youth. fourteen-year-old alira sanson from grand rapids, michigan, admits, "i love my high school's menu. it is much better than middle school food. i eat a giant chocolate chip cookie and a bag of chips for lunch every day—because i can." the middle school menu alira refers to is the government-regulated hot lunch mandated in elementary and middle schools across the nation. lunches at the high school level are often under site-based management, and food service officials are under pressure to provide food that sells. this pressure renders unhealthy choices, and the resulting menus are detrimental to students. what is the topic of this passage? a. high school food is better than middle school food. b. high school students can choose their lunches, but middle school students cannot. c. a comparison of hot lunches in the united states d. the nutritional value of high school lunches