Weegy: The cephalothorax is a fusion of: the head and thorax region. User: Gas exchange in an echinoderm takes place through A. book lungs. B. skin gills. C. lungs. D. none of the above. (More)

Weegy: Most adult echinoderms have five-part radial symmetry. User: Oxygen is moved around the body of an echinoderm in its A. madreporite. B. bony plates. C. water vascular system. D. arms. Weegy: Oxygen is moved around the body of an echinoderm in its water vascular system. User: An arthropod's exoskeleton performs all of the following functions except A. production of gametes. B. protection of internal organs. C. support of the animal's body. D. preventing loss of body water. Weegy: An arthropod's exoskeleton performs all of the following functions except: production of gametes. User: Which of the following is a characteristic of all arthropods? A. simple, single-lens eyes B. setae C. jointed appendages D. jaws Weegy: Jointed appendages is a characteristic of all arthropods. (More)

Weegy: Amphibians live near the water because they need to lay their eggs in water. Source(s): (More)

Weegy: My answer is A = Mollusks. User: The purple cell in the diagram is a choanocyte from the sponge. It is involved in A. sponge feeding. B. sponge reproduction. C. waste removal. D. all of the above (More)

Weegy: The sea cucumber is an echinoderm which does not show obvious five-part radial symmetry outside of its body. User: Place the following steps for complete metamorphosis in sequential order: A - larva encloses itself in a chrysalis B - adult lays eggs C - pupa develops into an adult inside the chrysalis D - eggs hatch into larvae E - Adult emerges from the chrysalis A. A, B, C, D, E B. B, D, A, C, E C. C, A, E, B, D D. E, C, A, D, B Weegy: Sequence is: B, D, A, C, E. B - adult lays eggs; D - eggs hatch into larvae; A - larva encloses itself in a chrysalis; C - pupa develops into an adult inside the chrysalis; E - Adult emerges from the chrysalis. User: All of the following are arthropods except A. crustaceans. B. echinoderms. C. arachnids. D. insects. Weegy: All of the following are arthropods except: echinoderms. User: Which embryonic characteristic of chordates develops into structures in the head and neck in land vertebrates? A. notochord B. dorsal nerve chord C. postanal tail D. pharyngeal pouches Weegy: Pharyngeal pouches are an embryonic characteristic of chordates which develop into structures in the head and neck in land vertebrates. (More)