The current model of the atom suggests that a)an electron cloud surrounds the nucleus. b)a proton cloud surrouds the nucleus. c)electrons travel in a definite path around the nucleus. d)the exact path of a moving electron can be predicted

Which group of chordates does  notpossess true backbones?                 a.  birds      b.  frogs and toads      c.  lampreys      d.  crocodilians

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Where is the nictitating membrane found? a. between the eyelid and the eyeball b. between the retina and the optic nerve c. between the outer and middle ear d. in the organ of corti in the middle ear