Question

the technique of breaking coral into smaller pieces and regrowing it is referred to as
coral blending
gene splicing
coral colonization
micro - fragmentation
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Explanation:

Coral micro-fragmentation is a restoration technique where corals are cut into small pieces, which grow and mature more quickly than larger colonies. Coral blending is not a standard term for this practice, gene splicing is a genetic engineering method, and coral colonization refers to corals establishing in a new area naturally or via transplantation of whole colonies, not breaking and regrowing small pieces.

Answer:

micro - fragmentation