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LEVEL of ORGANIZATION: (Cellular, Tissue, Organ)
- - Porifera (Cellular Level)
- - Cnidaria & Ctenophora (Tissue Level)
- - Platyhelminthes = Chordata (Organ Level)
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SYMMETRY: (Asymmetry, Radial Symmetry, Bilateral Symmetry)
- - Porifera (Asymmetry)
- - Cnidaria & Ctenphora (Radial Symmetry)
- - Platyhelminthes = Chordata (Bilateral Symmetry)
Note: Echinodermata = bilateral-symmetrical as larvae, radially-symmetrical as adults
Bilateral Symmetry: 
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NUMBER of TISSUE LAYERS in the BODY WALL: (Diploblastic, Triploblastic)
- - Porifera (N/A)
- - Cnidaria & Ctenophora (Diploblastic)
- - Platyhelminthes = Chordata (Triploblastic)
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BODY PLAN: (Acoelmate, Pseudocoelomate, Eucoelomate) "Organism must be Triploblastic"
- - Porifera, Cnidaria & Ctenophora (N/A)
- - Platyhelminthes & Nemertea (Acoelomate)
- - Nematoda & Rotifera (Pseudocoelomate)
- - Mollusca = Chordata (Eucoelomate)
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DEVELOPMENT: (Protostome, Deuterostome) "Organism must be a Eucoelmate"
- - Porifera = Rotifera (N/A)
- - Mollusca = Arthropoda (Protostomes; "Schizocoelomates")
- - Lophophorates, Echinoderms & Chordates (Deuterostomes; Enterocoelomates")
See paper notes for more info
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DIGESTIVE TRACT: (Incomplete, Complete)
- - Porifera (N/A)
- - Cnidaria = Platyhelminthes (Incomplete = "Gastrovascular Cavity")
- - Nemertea = Chordata (Complete = "Alimentary Canal")
Note: Cestodes (Tapeworms) do not have a digestive tract
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VERTEBRATE or INVERTEBRATE:
- - Portifera = Cephalochordata (Invertebrate)
- - Vertebrata (Vertebrates)
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Blastopore
- - Gametes
- - Zygote
- - 16-cell stage, "morula" = "solid ball stage"
- - "Blastulas" stage = "hollow ball" stage
- - "Gastrula" stage
- - Blastopore (Ectoderm, Meoderm, Endoderm, Archenteron "primative gut")
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Circulatory System
- - Open = Artery, Hemocoel, Vien
- - Closed = Artery, Arterioles, Capilaries, Venule, Veins
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