McGraw-Hill Online Learning Center Test

1. Review the image and answer the following questions.

Why does the herbivore have a considerably longer digestive tract than the insectivore?

A. Herbivores consume more food than predators.
B. Herbivores are generally larger animals and thus have larger digestive tracts.
C. Cellulose is considerably harder to digest.
D. Herbivores consume a greater variety of foods; certain portions of the digestive tract are required for the digestion of each food type.

2. Why does the insectivore lack a cecum, or other pouch, typical of a herbivore digestive tract?

A. Insects are relatively easy to digest and there is no need for pouches holding symbiotic bacteria.
B. Insectivores are relatively small and there is no room in their bodies for digestive pouches.
C. Insectivores evolved prior to the advent of digestive pouches in mammals.
D. None of these is correct.

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