Mastering Biology Questions and Answers Graded A

Mastering Biology Questions and Answers Graded A Nematodes and arthropods are the largest ecdysozoan phyla. Which of the following statements are true? -Both nematodes and arthropods possess an external covering, or cuticle. -Nematodes possess a closed circulatory system. -Arthropods possess an open circulatory system. -Nematodes are acoelomate, whereas arthropods are coelomate. -Some nematodes are parasitic on humans. -Both nematodes and arthropods have segmented body plans. -Both nematodes and arthropods must molt in order to increase in size. -The cuticle in nematodes lengthens as the animal grows. -Arthropods are named for their jointed appendages. -Both nematodes and arthropods possess an external covering, or cuticle. -Arthropods possess an open circulatory system. -Some nematodes are parasitic on humans. -Both nematodes and arthropods must molt in order to increase in size. -Arthropods are named for their jointed appendages. The phylum Arthropoda includes four major lineages Cheliceriforms Myriapods Insects Crustceans Cheliceriforms Horseshoe crab Arachnids Possesses claw-like feeding appendages Myriapods Millipedes and centipedes exclusively terrestrial Insects Butterfly Wings allow flight Body divided into head, thorax, abdomen Three pairs of walking legs Crustceans Primarily aquatic Crabs and Isopods Two pairs of antennae Insects: Coleoptera Beetles complete metamorphosis hard forewings to protect membraneous hind wings Diptera Flies complete metamorphosis hind wings reduced to stabilizers Hemiptera "true bugs" Incomplete metamorphosis Thick forewings (except at tips) Lepidoptera Butterflies, moths complete metamorphosis wings have scales Orthoptera Grasshoppers, crickets incomplete metamorphosis one pair of leathery wings, one pair of membraneous wings Trichoptera caddisflies complete metamorphosis hairy wings Adaptive radiation Rapid and extensive speciation in a single lineage Diversification of a group of organisms into forms filling different ecological niches