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What are the major evolutionary feats shared by all 3 phyla( Platyhelminthes, Nematoda, and
Annelida)? What are the implications of these evolutionary feats? What two additional
evolutionary feats are exhibited by Nemotoda? And 2 feats by Annelida?
Solution
Answer:
The major evolutionary feats shared by Platyhelminthes, Nematoda and Annelida are:
1. Level of Organization- Organ system level of organization
The organisms possesses distinct organ systems which marks the evolution of organ systems in
animals.
2. Symmetry - Bilateral
This is often a result of moving in one direction, thus having a “head” end.
3. Triploblastic
They share common body wall organization, consisting of 3 layers. Three germ layers are
evidence of slowly adapting layers of developmental control during embryogenesis as cells
specialized for greater efficiency.
Two additional evolutionary feats exhibited by Nematoda are:
1. Coelom- Pseudocoelomate
2. Digestive system -Complete
Two feats of Annelida are:
1. Segmentation - Presented
2. Circulatory system -Present

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What are the major evolutionary feats shared by all 3 phyla( Platyhe.pdf

  • 1. What are the major evolutionary feats shared by all 3 phyla( Platyhelminthes, Nematoda, and Annelida)? What are the implications of these evolutionary feats? What two additional evolutionary feats are exhibited by Nemotoda? And 2 feats by Annelida? Solution Answer: The major evolutionary feats shared by Platyhelminthes, Nematoda and Annelida are: 1. Level of Organization- Organ system level of organization The organisms possesses distinct organ systems which marks the evolution of organ systems in animals. 2. Symmetry - Bilateral This is often a result of moving in one direction, thus having a “head” end. 3. Triploblastic They share common body wall organization, consisting of 3 layers. Three germ layers are evidence of slowly adapting layers of developmental control during embryogenesis as cells specialized for greater efficiency. Two additional evolutionary feats exhibited by Nematoda are: 1. Coelom- Pseudocoelomate 2. Digestive system -Complete Two feats of Annelida are: 1. Segmentation - Presented 2. Circulatory system -Present