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  1. M

    Which of the following has a ventral nerve cord?

    a. hummingbird b. shark c. coelacanth d. frog e. earthworm
  2. M

    The great size and mobility of the vertebrates is associated with what?

    a. uterine development of offspring b. four chamber hearts c. lightweight endoskeletons d. increased brain size and complexity e. lungs used for respiration
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