12. The class sets up an experiment with the four flasks as shown.
Flask 1:
Flask 2:
Flask 3:
Flask 4:
100 ml water, 1 ml. bromthymol blue, plant
100 ml. water. I ml. bromthymol blue, 2 small fish
100 ml. water, 1 ml. bromthymol blue, 2 small fish, plant
water, I ml. bromthymol blue
100 ml
43
Flank 2
Flak 3
Flask 4
Which flasks contain organisms undergoing cellular respiration?