<prompt> Bilateral Compressed and wingless body, conical head, short piercing mouth parts and three pairs of strong legs is the description ofRat fleaSoft tickHard tickMite  <response>: Ans. a Rat flea Ref. Park Textbook of PSM 22ndpg. 712ARTHROPODS OF MEDICAL INTEREST InsectaArachnidaCrustacea1Body divisionsHead, Thorax, AbdomenCephalothorax and abdomen sometimes no divisionCephalothorax and abdomen2Legs3 pairs4 pairs5 pairs3Antennae1 pairNone2 pairs4WingsOne or two pairs, some winglessNoneNone5Where foundOn landOn landIn water - Rat flea belongs to class Insecta which has 3 pairs of legs. Option 2, 3, 4 belongs to class Arachnida which has 4 pairs of legs. Cyclops belongs to class Crusteacea which has 5 pairs of legs.ClassIncludesClass Insecta includes Mosquito, Flies houseflies, sand flies, tsetse flies, black flies Human lice Fleas Reduviid bugsClass Arachnida includes Ticks hard soft tick, Mites trombiculid, itch miteClass Crusteacea includes Cyclops. 