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Coral reefs are composed of small cnidarians, in the form of a polyp. These small organisms form a calcium skeleton to support them. The coral polyps house algae in their bodies, which often makes them look green, red or other colors. The algae undergo photosynthesis and produce energy for themselves and the coral. In return, the coral protects the algae from the environment and predators using their stinging cells (nematocysts). This is an example of: (select all that apply)
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