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The simplest group of true animals
What grade of organization do sponges have and why?
Cellular grade b/c no true tissues
Cells of the sponge that take in nutrients by phagocytosis
Opening of a sponge where water exits
Pores in the sponge where water enters into
Skeletal elements of the sponge that support the body
Asymmetrical or Radially symmetrical
Adult sponges are non-mobile
What type of feeders are sponges?
What does it mean that cnidarians exhibit gastrulation?
They have two embryonic germ layers and a gut
Cell type of cnidarians that produce stinging organelles
Stinging organelles of Cnidarians
Jelly-like substance that lies between the ectoderm and endoderm of the Cnidarian
What symmetry do Cnidarians have?
Gastrovascular Cavity (2)
- Provides for digestive and vascular functions
- Single opening called the "mouth" which serves as both mouth & anus
- Solitary polyp
- no medusa stage
- Extensive polyp colony
- Small medusa
- Small solitary polyp
- Well-developed medusa
- Portuguese man-of-war
- Colonial and free-floating
True "jellies"- medusa stage dominates and the polyp stage is reduced
Polyp stage dominates and medusa stage is absent
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