Chapter 33 Lecture Enrichment Ideas
Provide either specimens or slides to compare size, structure, habitats, and relative complexity of the different invertebrates.
Discuss possible reasons why there appeared to be a sudden explosion of development of animal phyla during the early Cambrian period.
Contrast the inverted structures of the medusa and polyp forms of cnidaria, and examine how the body structure is different from that of a sponge.
Compare the body structure of the flatworm and the roundworm, with emphasis on body layers, digestive tract, and reproduction.
Most of these parasitic diseases are tropical; utilize slides or other audiovisuals to illustrate the ravages of elephantiasis, fluke infestations, etc. Many cultural habits have evolved to circumvent ingestion of these parasites; describe the benefits of hygiene, plumbing, etc. noting that some depend upon a minimal affluence that is not available in poor regions of the world. Many students do not realize the extent they avoid suffering due to U.S. customs and engineering, etc.
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