What do the simplest vertebrates lack?
a. Jaws
b. Notochord
c. Central nervous system
d. Teeth
ANS: A
The simplest vertebrates lack jaws. They still have a partially enclosed central nervous system
extending from the skull. Information can be found in the section Vertebrate Evolution Traces a Long
and Diverse History.
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A ________ is an instrument used to measure humidity
A) hygrometer. B) aquimeter. C) hydrometer. D) humidimeter.
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a. sinkholes b. disappearing streams c. swallow holes d. conical hills (haystack hills) e. speleothems
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