EVERYDAY SCIENCE

Detailed explanation-1: -Oyster are bivalve molluse. They are sedentary in habit found attached to rocks.

Detailed explanation-2: –Sedentary animals include many protozoan’s, for example, some foraminifers, heliozoans, and infusorians (including vorticella and stentor). Many of them live in the tubes of polychaetous worms. For example: Barnacles, some bivalve mollusks, all bryozoans, brachiopods, stalked crinoids, and ascidians.

Detailed explanation-3: -Sponges (phylum Porifera) are exclusively aquatic, sedentary, filter-feeding invertebrates, occupying essentially all benthic marine and some freshwater environments.