Final answer:
Melanesia, Micronesia, and Polynesia are distinct regions in the South Pacific with varying island characteristics.
Explanation:
Melanesia includes islands from Papua New Guinea to Fiji, Micronesia consists of small islands north of Melanesia, and Polynesia encompasses island groups from the Hawaiian Islands to the Pitcairn Islands. Low islands are coral-based and low-lying, while high islands are volcanic and mountainous with high elevations.
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