Coral Reefs 16.1

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Across
  1. 5. Corals that do not build reefs because they don’t produce hard, reef-forming skeletons.
  2. 6. Tissue inside corals used for digestion and sometimes defense against other corals.
  3. 7. Bleaching happens when corals lose the algae living inside them, causing them to turn white and become weak, often due to heat or stress.
Down
  1. 1. The breakdown of coral reefs by living organisms like fish, worms, and sea urchins that bore into or eat the coral.
  2. 2. A free-swimming coral larva that travels in the water before settling and forming a new coral colony.
  3. 3. A hard, wave-exposed part of a reef where algae grow and help strengthen the reef structure.
  4. 4. Corals that build reefs by producing hard calcium carbonate skeletons.