A respirоmeter is а cоntаiner used tо meаsure the amount of oxygen consumed by an organism. A respirometer was used to determine how environmental temperature affects the uptake of oxygen in one 300-gram rat and one 50-gram mouse. The results of this experiment are shown on the graph below. A graph with y-axis labeled relative amount of oxygen consumed per gram of tissue from zero to one-hundred in increments of 25. The x-axis is labeled time in minutes from zero to eight in increments of 1. There are four curves representing the amount of oxygen consumed by an organism. The first curve is a mouse at twelve degrees Celsius, the curve increases steadily until two minutes then the rate increases, reaching 100 just after three minutes. The second curve is a mouse at twenty degrees Celsius. The curve has an increasing rate, reaching 100 between five and six minutes. The third curve is rat at twelve degrees Celsius. The rate is increasing, reaching 100 between seven and eight minutes. The fourth curve is a rat at twenty degrees Celsius. The curve increases steadily until two minutes, then there is an increase in the rate, reaching 50 between seven and eight minutes. Which of the following hypotheses is best supported by the results of this experiment?