Answer:
4.protection
5.diseases
8.smooth skin
Explanation:
4. animals with bodies being covered can be used for protection like hetchog or armadillo
5.The placoid scales of cartilaginous fishes are also called dermal denticles and are structurally homologous with vertebrate teeth. Most fish are also covered in a layer of mucus or slime which can protect against pathogens such as bacteria, fungi, and viruses, and reduce surface resistance when the fish swims.
8.worms has smoothe skin
