During the great mass extinction of Late Ordovician, many bottom-dwelling species of __________ died out.

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Bryozoans, also known as "moss animals," were among the dominant bottom-dwelling species in the Late Ordovician. They were particularly susceptible to the environmental changes that occurred during the extinction event, such as changes in sea level and water chemistry. As a result, many species of bryozoans went extinct during this time.

During the Great Mass Extinction of Late Ordovician, Many Bottom-Dwelling