Which of these animal groups was NOT present by the end of the Cambrian? bryozoans arthropods chordates mollusks

1 answer:

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Only phylum bryozoans were not present during Cambrian period. It is an extensive fossil that did not appear in Cambrian nor pre-cambrian rocks. Bryozoans are found in the early Ordovician period. It could have probably existed during the Cambrian period but were soft-bodied or not preserved.

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