NAME: SECTIONDATE DISCUSSION QUESTIONS 1. What are the changes you see in symmet
ID: 220282 • Letter: N
Question
NAME: SECTIONDATE DISCUSSION QUESTIONS 1. What are the changes you see in symmetry when looking at animals from phylum Porifera C through phylum Chordata? What are the changes you see in the level of organization and body cavity type when looking at animals from phylum Porifera through phylum Chordata? 2. 3. What are the changes you see in the digestive system? 4. What are the changes you see in the nervous system? 5. What are the changes you see in the circulatory and respiratory systems? 6. What are the changes you see in the type of body support?Explanation / Answer
1) Porifera
Symmetry: Absent
Cnidaria
Symmetry: Radial
Platyhelminthes, Mollusca, Annelida, Nematoda, Arthropoda, Chordata
Symmetry: Bilateral
Echinodermata
Symmetry: Bilateral Larvae and Radial Adults
2) Porifera
Level of Organization: Cellular; lack tissues and organs
Cnidaria
Level of Organization: Tissue; Lack Organs
Platyhelminthes, Mollusca, Annelida, Nematoda, Arthropoda, Echinodermata, Chordata
Level of Organization: Organs
3) Porifera, Cnidaria, Platyhelminthes
Body Cavity: Absent
Mollusca, Arthropoda
Body Cavity: Reduced Coelom
Annelida, Echinodermata, Chordata
Body Cavity: Coelom
Nematoda
Body Cavity: Pseudocoelom
4) Porifera
Nervous System: Absent
Cnidaria
Nervous System: Nerve Net
Platyhelminthes
Nervous System: Gastrovascular Cavity
Mollusca
Nervous System: Ganglia; Nerve Cords
Annelida, Arthropoda
Nervous System: Brain; Ventral Nerve Cords
Nematoda
Nervous System: Brain; Nerve Cords
Echinodermata
Nervous System: No Brain; Nerve ring and radial nerves
Chordata
Nervous System: Well-developed brain; dorsal hollow nerve cord
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