Traditional animal phylogenetic trees and the most recent molecular phylogenetic trees have many similarities. Which is a feature of the recent trees that was not present in the traditional phylogeny?

Question

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Traditional phylogenetic trees, often based on morphological characteristics, did not group nematodes and arthropods together. However, molecular phylogenetic analyses have revealed that these two groups share a common evolutionary history and are grouped together in the Ecdysozoa clade, based on their shared characteristic of molting or ecdysis.

Traditional Animal Phylogenetic Trees and the Most Recent Molecular Phylogenetic