Classification of Living Things. Tools Used to Classify Organisms 1. Comparative Morphology Compares Physical Structures, Traits 2. Evolutionary Relationships.
Cnidarians
Colorectal polyp
Development 3 phyla
Polyp
Chapter 17 The Evolution of Animals. What Is an Animal? – Animals are: Eukaryotic Multicellular Heterotrophic organisms that obtain nutrients by ingestion.
Phyla of invertebrates include 1.Porifera 2.Cnidarian 3.Flatworms 4.Roundworms 5.Segmented worms 6.Mollusks 7.Arthropods 8.Echinoderms i n o r d e r o.
GI Grand Rounds October 1, 2004 Yoshi Makino, M.D. USC Department of Internal Medicine.
Colon Cancer. Epidemiology 3 rd most common cancer in males and females. Accounts for 11% of cancer deaths. In 2000, 130,200 cases (colon and rectum).
What are they? Invertebrate Animals. Invertebrates Animals that do not have a backbone or any bone tissue. Most are limited in size because of support.
Chapter 33
Molecular Evolution and Phylogeny
