The phrase "are largely comprised" is not correct in standard English usage.
The correct expression is "are largely composed of" or "largely comprise."
Example: "The committee members are largely composed of experts in their respective fields."
Alternatives: "are mainly made up of" or "largely consist of."
Freshwater ecosystems across the Amazon are largely comprised of small streams and headwaters of riparian zones.
Many other insurance markets, such as auto and health insurance, are largely comprised of private providers.
While all sorts of books are shared online, many of the ebook sharing sites I've come across are largely comprised of romance novels.
Susanna Moodie is, of course, best known for her books Roughing It in the Bush and Life in the Clearings, which are largely comprised of short sketches that she had previously published.
Putin's supporters, who are largely comprised of older, less educated and rural voters tend to favor this ban.
Analysis of chromosomal organization of these proteins revealed that approximately 80% (872 of 1100) were located in the 4.9 Mb central core (containing only 56% of all genes) reinforcing the belief that the chromosome arms are largely comprised of auxiliary genes [8].
The Tetrahymena inverted repeat is largely comprised of the large subunit ribosomal RNAs and also contains tRNAs, including trnL paralogs, whereas Oxytricha's appears to be largely comprised of protein-coding ORFs of unknown function.
Comparisons between antithrombotic treatments were largely comprised of single, albeit large, studies.
While Google, Facebook, Apple and other large public tech companies are standard bearers within the U.S. economy, Silicon Valley is largely comprised of startups at various stages, as well as venture capital firms, many of which fall under the purview of the Securities and Exchange Commission.
