| 41. | Coral reefs exist in seawater salinities from 25 to 42 %.
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| 42. | The Coral Reef Alliance, http : / / www . coral . org
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| 43. | Ciguatera toxins appear to accumulate in top predators of coral reefs.
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| 44. | Today the island attracts tourists drawn to its unspoiled coral reefs.
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| 45. | The artists took scuba diving lessons to study the coral reef.
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| 46. | Coral reefs are made up of the calcium skeletons of million of polyps.
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| 47. | The island is set in the middle of a coral reef.
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| 48. | Coral Reef Initiative : http : / / www . icriforum . org
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| 49. | The coast of the island is surrounded by a coral reef.
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| 50. | He daydreamed about exploring coral reefs and identifying exotic fish.
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