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    Matching. Choose the most appropriate answer for each.
    1a. ___ placozoa
    1b. ___ annelids
    1c. ___ arthropods
    1d. ___ chordates
    1e. ___ cnidarians
    1f. ___ echinoderms
    1g. ___ flatworms
    1h. ___ rotifers
    1i. ___mollusks
    1j. ___ roundworms
    1k. ___ sponges

    A. Trichoplax
    B. Vertebrates
    C. Planarians, flukes, tapeworms
    D. Nematodes
    E. Snails, squids, clams
    F. Wheel animals
    G. Collar cells present
    H. Jellyfish and corals
    I. Crustaceans, ticks, and insects
    J. Polychaetes, earthworms, leeches
    K. Sea urchins, sea stars

    Matching. Choose the most appropriate answer for each.
    A. Porifera
    B. Cnidaria
    C. Platyhelminthes
    D. Nematoda
    E. Annelida

    2a. Members of this phylum have a pseudocoelomic cavity.
    2b. Members of this group have a brain with a nerve cords, a saclike or branched gut, and lack a circulatory system.
    2c. Members of this phylum have a brain with a ventral nerve cord, a complete gut, and a circulatory system that is usually closed.
    2d. This phylum contains the most primitive species of the animal kingdom.
    2c. This phylum includes jellyfish and sea anemones.
    Matching. Choose the most appropriate answer for each.
    A. Annelida
    B. Arthropoda
    C. Mollusca
    D. Echinodermata

    3a. Members of this phylum display obvious, uniform segmentation from anterior to posterior.
    3b. The larval stage in this phylum has bilateral symmetry, whereas the adult stage exhibits radial symmetry.
    3c. Although most are enclosed by hardened shells, this phylum name literally means "soft body".
    3d. This phylum has the greatest number of species.
    3e. Millipeds are in this phylum.

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    Solution Preview

    1a. A (trichoplax)
    1b. J (polychaetes, earthworms, leeches)
    1c. I (crustaceans, ticks, insects)
    1d. B (vertebrates)
    1e. H ...