Explanation (a) Osteichthyes is known as the bony fish that has skeleton primarily composed of bone tissue. (b) Parapodia are predominantly found in annelids. They are lateral outgrowth or protusions from the body. (c) Reptile skin is covered with scutes or scales which are formed from the epidermis. (d) Ctenophor acommonly known as comb plates or comb jellies which are invertebrate animals that live in marine water. (e) Radula is an anatomical structure used by molluscs for feeding, sometimes compared to a tongue. (f) Mammals are vertebrate constituting the Mammalia class which have fur, hair and mammary glands for feeding their young ones. (g) Choanocytes are cells found in body type sponges. Example, Porifera is a sponge. (h) Gill slits are individual openings to gills which lack a single outer cover. Example, cyclostomata are also known as jawless fishes and chondrichthyes are cartilaginous fishes with jaws. Final Answer (a) Operculum- Osteichthyes (b) Parapodia- Annelida (c) Scales- Reptilia (d) Comb plates- Ctenophora (e) Radula- Mollusca (f) Hair- Mammalia (g) Choanocytes- Porifera (h) Gill slits- Cyclostomata and Chondrichthyes
