A line graph is shown where, x-axis is 'Temperature in Celsius' ranges from 0 to 40 in increment of 5 and y-axis is 'Number of Oxygen Bubbles (per minute)' ranges from 0 to 80 with an increment of 10. A line passes through (0 comma 0), (10 comma 10), (15 comma 20), (20 comma 45), (30 comma 70), (35 comma 30) and (40 comma 0).