If you watch words flash briefly and faintly, which of these are you least likely to identify correctly?

PET scans have demonstrated that when you are creating a visual image, ________

a) the image is generated by the retinal ganglion cells and sent to the cortex b) the image is generated by the thalamus and sent to the brain c) the areas associated with stored knowledge send information to the visual cortex d) there is no locus in the brain that can be determined for the generation of visual images

When the genetic code (XX or XY) begins to assert itself,

a. genetic activity on the Y sex chromosome causes ovaries to begin to differentiate. b. genetic activity on the X sex chromosome causes ovaries to begin to differentiate. c. ovaries begin to differentiate if the Y sex chromosome is absent. d. testes begin to differentiate if the Y sex chromosome is absent.