Why would so many earthquakes originate along the slab of lithosphere that is descending into the mantle?

As the slab descends into the mantle, rheology changes cause the plate to bend and deform, and generates these earthquakes. The trend of such events can be seen in cross-sections of subduction zones

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many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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