Members of the ____ subphylum are now all extinct, but they were extremely numerous in shallow Paleozoic seas

Most of them were dorsoventrally flattened and heavily armored, with two deep longitudinal grooves that gave their body
a three-lobed appearance.



a. Myriapoda
b. Trilobita
c. Chelicerata
d. Hexapoda
e. Crustacea


ANSWER: b

Biology & Microbiology

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