You find a small animal with eight legs crawling up your bedroom wall. Closer examination will probably reveal that this animal has a head, thorax, and abdomen. simple, but not compound, eyes. tracheae and spiracles. two pairs of antennae.
  • Cnidaria and Bilateria
  • only have longitudinal muscles
  • simple, but not compound eyes
  • use of fluid in the body cavity as a hydrostatic skelton
The members of which clade in the phylum Cnidaria occur only as polyps?
  • Scyphozoa
  • Anthozoa
  • gastropods
  • Arthropoda
How many of the following can be used to distinguish a nematode worm from an annelid worm?type of body cavitynumber of muscle layers in the body wallpresence of segmentationnumber of embryonic tissue layersshape of worm in cross-sectional view 1 2 and 3 1, 2, and 3 2, 3, 4 and 5 All of the options are correct.
  • 1,2,3,4
  • 124
  • mollusc.
  • 123
Nematode worms and annelid worms share which of the following features? absence of species with parasitic lifestyles use of fluid in the body cavity as a hydrostatic skeleton presence of segmentation ecdysis presence of a circulatory system
  • only have longitudinal muscles
  • the radically different appearance between adults and earlier life stages
  • encysted in the muscles of an animal, such as a cow or pig.
  • use of fluid in the body cavity as a hydrostatic skelton
A marine biologist dredges up a small animal from the bottom of the ocean. It is uniformly segmented, with short, stiff appendages and soft, flexible skin. It has a complete digestive system and a closed circulatory system, plus multiple true coeloms. Based on this, you determine that the animal must be a(n) _____.A marine biologist dredges up a small animal from the bottom of the ocean. It is uniformly segmented, with short, stiff appendages and soft, flexible skin. It has a complete digestive system and a closed circulatory system, plus multiple true coeloms. Based on this, you determine that the animal must be a(n) _____. lancelet annelid mollusc crustacean roundworm
  • annelids
  • a mantle.
  • Anthozoa
  • mollusc.
How many of the following are characteristics of at least some members of the phylum Cnidaria?a gastrovascular cavitya polyp stagea medusa stagecnidocytesa pseudocoelom
  • 1,2,3,4
  • Anthozoa
  • Cnidaria
  • mollusc.
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