I want to know the answer to the following question:
How many previously-separate phyla did the 2007 study reclassify?
All the background I'm provided with is that "In addition to re-writing the classification of annelids and 3 previously independent phyla, the molecular phylogenetics analyses undermine the emphasis that decades of previous writings placed on the importance of segmentation in the classification of invertebrates.". Is that enough to answer the question?
Answer: yes