Some students are performing a hydrobiology project on a creek. they obtained the gpp value as 7 mg/l and the r value as 3 mg/l. what could be the npp for the creek water?

The answer is C, with 4mg/l. Because 7-3, equals four and secondly, just took the test and the answer was four.

answer; ///i believe its: ///(embolus);

one centimetre is equal to 0.01 metres