Ecdysozoans

Arthropods molt becausea. Their old exoskelton does not grow with their bodyb. It helps them escape predatorsc. None of the above

Most insectsa. Have two pairs of wings and two pairs of legsb. Have one pair of wings and six pairs of legsc. Cannot flyd. Have two pairs of wings and three pairs of legs

Spiders, scorpians, and mites belong to the subphyluma. Urochordatab. Crustaceac. Trilobitad. Chelicerata

The largest phylum of pseudocoelomates isa. Cycliophorab. Platyhelminthesc. Cestodad. Nematodae. Rotifera

An example of a hermaphroditic crustacean is thea. crabb. lobsterc. barnacled. crayfish

All crustaceans have a unique kind of larva called aa. niaidb. naupilusc. trochophored. planulae. nymph

The foremost appendages on spiders area. pedipalpsb. maxillaec. antennaed. cheliceraee. mandibles

In horseshoe crabs, the most anterior appendages are thea. antennaeb. pinchersc. mandiblesd. pedipalpse. chelicerae

The molting process in arthropods is known asa. ecdysisb. tagmatizationc. metamorphosisd. paedomorphosise. cephalization

Chemicals for insect communication are calleda. ecdysonesb. protosonesc. pheromonesd. deuterosonese. none of the above

While most insects have four wings, _______________ have only two.a. termitesb. fliesc. fleasd. bedbugse. crickets

The second pair of spider appendages is thea. maxillaeb. uropodsc. pedipalpsd. mandiblese. chelicerae

Which one of the following is not a characteristic of the arthropods?a. jointed appendagesb. exoskeletonc. coelomd. segmented bodye. All of the above are characteristic of the arthropods

Which one of the following is not a crustacean?a. lobsterb. copepodc. horseshoe crabd. barnaclee. crayfish

The largest group of arthropods is the:a. arachnidsb. crustaceansc. insectsd. millipedese. centipedes

Having chelicerae, a body divided into an anterior cephalothorax and posterior abdomen, and book lungs is characteristic of:a. arachnidsb. insectsc. millipedesd. crustaceanse. trilobites

Which of the following are not arthropods?a. earthwormsb. crayfishc. spidersd. butterfliese. both a and c