Food for Thought 17. Contrast the digestive systems of free-living and parasitic

Question

Food for Thought 17. Contrast the digestive systems of free-living and parasitic flatworms. 18. Explain the relatonshijp between the tremendous numbers of eggs produced by flukes and tapeworms and the complexity of their life cycles. 19. The relatively simple animals Hydra and Dugesia can regenerate lost body parts, but humans generally can- not. Discuss this in terms of tissue differentiation and the comparative levels of structural complexity of these organisms. 20. Search the World Wide Web for sites that include references to flatworms or rotifers. List two addresses and briefly describe their contents. http:// http://

Explanation / Answer

1) Following are differences between the digestive systems of free living and parasitic flatworms.  

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