Which of the following statements about bryozoans (ectoprocts) is correct? a. Adult bryozoans are sessile, but their larvae make up much of marine plankton. b. Bryozoans are colonial, build reefs, and are related to corals. c. Bryozoans build reefs and have lophophores that extend through a hard exoskeleton. d. Bryozoans are colonial and live amongst mosses.