a. Compare corresponding characteristics of plants and animals.
Answer
b. What one animal characteristic can be associated with an animal's need to acquire food?
Answer
c. Why is it reasonable to assume that animals arose from protozoans?
Answer
d. Some animals can regenerate from a small part of the whole. Why would you expect only simple animals, and not those with highly differentiated tissues, to be able to do this?
Answer
2. Some animals have a complete (both mouth and anus) digestive tract, and some have an incomplete (only one opening) digestive tract.
a. In which type of animal would you expect the digestive tract to have specialized parts? Why?
Answer
b. Why is it consistent that a coelomate animal would have a complete digestive tract with specialized parts?
Answer
c. In which type of animal would you expect the animal to be a discontinuous (eat at intervals) feeder?
Answer
d. In more complex animals, blood vessels deliver the product of digestion to the cells. How does a planarian make do without a circulatory system?
Answer
