Question

3.
Ahmad wants to find out how the temperature of water affects the amount of oxygen in the water
in an aquarium. Which of the following set-ups should he use for his investigation to ensure a fair
test?
Clear glass
Layer of oil
Fish
Water at 20 °C
Water plant
(II)
Clear glass
Painted
glass
Fish
Water at 40 °C
Water plant
(III)
(IV)​

Answer 1

Answer:

by crisilization method