Compared to humans, koalas have a ______ level of physical activity, and food to fuel this activity spends a _______ time being digested in the gut
a. higher; shorter
b. higher; longer
c. similar; similar
d. lower; shorter
e. lower; longer
E; Adult koalas move for just four minutes a day, a level of activity that would make the world's worst couch potato look like Carl Lewis. You might expect that this would lower their energy needs (which it does) and that would mean they would not have to digest food as carefully (which it does not). The koala diet is so nutrient-poor that koalas spend a long time extracting food from the leaf particles, which spend a long time in the koala gut, much longer than it takes for food to traverse the human gut.
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A. IgG. B. IgE. C. IgM. D. IgD. E. IgA.
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