For each phylum, list the characteristics; 3.) Platyhelminthes Environment: Leve
ID: 184554 • Letter: F
Question
For each phylum, list the characteristics;
3.) Platyhelminthes
Environment:
Level of organization (e.g. porifera = cellular):
Body symmetry:
Germ layers:
support system:
Nervous system:
Digestive system:
Circulatory system:
Respiratory system:
Excretory System:
Other Distinguishing Features:
4.) Mollusks
For each phylum, list the characteristics:
Environment:
Level of organization (e.g. porifera = cellular):
Body symmetry:
Germ layers:
support system:
Nervous system:
Digestive system:
Circulatory system:
Respiratory system:
Excretory System:
Other Distinguishing Features:
Explanation / Answer
3) PLATYHELMINTHES CHARACTERISTICS:
- tissue-organ level of orginasation
-Bilateral symmetey.
-Triploblastic body. Third germ layer
-nervous system with large, interiorly situatedgangalia and nerve running aloung the body.
- digestive system branched and incomplete without anus.
-Circulatory system is wanting
- Excretory system includes lateral canals and protonephridia.Absent in some primitive forms.
-respiratory system are wanting.
- Better developed sensory organs.
- More complex and efficient gastrovascular cavity.
4) MOLLUSCA CHARACTERISTICS
- Tissue- system grade of body orginazation.
- bilaterally symmetrical.
- Triploblastic, coelomate, unsegmented.
- Nervous system of paired ganglia, connectives and nerves. Ganglia usually forms a circumentric ring.
- Digestivesystem complete with a gigestive gland or liver.
- Circulatory system is mainly of closed type.
- Respiration direct or by gillsor lungs or both.
- Excretion by apair of metanephradia.
- fertilization external.
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