ng the body structures of a sea anemone, a flatworm, a nematode, an annelid worm, and a fish. Are flatworms more like cnidarians or annelids? Are annelids more like flatworms or fish? Give evidence that supports yo

ng the body structures of a sea anemone, a flatworm, a nematode, an annelid worm, and a fish. Are flatworms more like cnidarians or annelids? Are annelids more like flatworms or fish? Give evidence that supports yo

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter28: Invertebrates

Section: Chapter Questions

Problem 3VCQ: Figure 28.45 Which of the following statements about insects is false? Insects have both dorsal and...

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Concept explainers

Animal Phylogeny

Cladistics is a method of biological classification where organisms are classified based on their ancestors and their relationship with them. It is defined as the concepts and methods for determining the branching patterns of evolution and evolutionary history. Some scientists, however, have preferred the term phylogenetic systematics or phylogenetic taxonomy to emphasize the reliance on a phylogeny for classification. It is the most common and accepted method for classifying organisms.

Question

Fill in Table 3.4 comparing the body structures of a sea anemone, a flatworm, a nematode, an annelid worm, and a fish. Are flatworms more like cnidarians or annelids? Are annelids more like flatworms or fish? Give evidence that supports your answer.

Table 3.4. Comparison of body structures of five groups of animals
Body Structure
Sea Anemone
Flatworm
Nematode
Annelid Worm
Fish
Mesoderm
Digestive System
Circulatory System
Coelom

Definition Definition A phylum of organisms also known as "flatworms". They are dorsoventrally flattened from head to tail. They are invertebrate, soft-bodied, acoelomate, unsegmented and have bilateral symmetry.

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