A microbial ecologist who is interested in studying how gene expression is influenced by different species of bacteria in a biofilm would most likely find a metagenomic library more useful than a genomic library.

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Metagenomic libraries contain DNA from multiple species within a given environment, allowing for the study of gene expression in the context of a community. In contrast, genomic libraries usually only contain the DNA from a single species, making it difficult to study the interactions and gene expression of multiple species within a biofilm.

A Microbial Ecologist Who Is Interested in Studying How Gene