An extinct group of arthropods with a body divided into three lobes is a(n) ____.

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The description given of a body divided into three lobes refers specifically to trilobites, an extinct group of arthropods that lived during the Paleozoic Era. Crinoids and echinoids are both types of echinoderms, while acritarchs are organic-walled microfossils, and organelles are structures within cells. None of these groups of organisms have a body divided into three distinct lobes.

An Extinct Group of Arthropods with a Body Divided into Three