Porifera

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Across
  1. 1. Water-filled channels lined with choanocytes.
  2. 4. Flagellated collar cell lining canals; traps food in mucus, creates water current.
  3. 6. Large opening at top; water exits sponge body.
  4. 7. Gelatinous matrix (cellular + non-cellular) between outer layer & spongocoel.
  5. 8. Location where sponge attaches to substrate (rock).
Down
  1. 2. Sharp skeletal elements (CaCO₃ or silica) for structure and defense.
  2. 3. Central cavity filled with water.
  3. 5. Microscopic pores where water enters sponge.