Final answer:
A 5 g mouse would consume the same amount of oxygen per unit time as a 10 g mouse.
Step-by-step explanation:
We are comparing the oxygen consumption of a 5 g mouse and a 10 g mouse in this question. The metabolic rate of the mouse is 890 mm³ O₂/g body mass/hr based on the available data. We can presume that the metabolic rate per gram of body mass is the same for both mice since they are both consuming oxygen. Consequently, the amount of oxygen consumed by a 5 g mouse and a 10 g mouse per unit of time would be equal. This is in contrast to the trend seen in other organisms, such as crickets, which show that at lower temperatures, the amount of oxygen consumed per gram of tissue decreases. This illustrates the variety of strategies that organisms employ to control their energy requirements.