A student used this apparatus to investigate the rate of aerobic respiration in woodlice. Which statement describes and explains the way the coloured liquid moves as the woodlice are respiring?
- AThe coloured liquid moves towards the test-tube because the woodlice are using carbon dioxide.
- BThe coloured liquid moves towards the test-tube because the woodlice are using oxygen.
- CThe coloured liquid moves away from the test-tube because the woodlice are using carbon dioxide.
- DThe coloured liquid moves away from the test-tube because the woodlice are using oxygen.