Porifera Skeletal Elements

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Across
  1. 1. Glass-like needle structures made of SiO₂
  2. 4. Reason that allows movement and resistance to water currents
  3. 6. Purpose of sharp spicules deterring predators
  4. 7. Specialized cells that secrete spicules
  5. 9. Production of mineral structures by living organisms
Down
  1. 2. Spicules + Spongin fibers (Porifera)
  2. 3. Needle-like skeletal structures made of CaCO₃
  3. 5. Spongin fibers specialized cells
  4. 8. Spicules with three axes
  5. 10. Skeletal function which anchors the sponge to substrates