DO stands for dissolved Oxygen in the water. Tank 1 Tank 2 Tank 3 Tank 4 Tank 5

Initial DO 10 ppm 10 ppm 10 ppm 10 ppm 10 ppm

Amount of organic waste 0 g 10 g 20 g 30 g 40 g

DO after one week 10 ppm 10 ppm 8 ppm 5 ppm 0 ppm

Based on this table what is the main purpose for the experiment?to determine how much oxygen the algae can produce

to collect data to determine how waste in water can be useful

the DO doubles each week

to determine that initial DO is not important

to observe the effect of organic wast on DO