The structure of neurons in our central nervous systems can change due to exposure to different environments, a phenomenon known as ______.

Which disease, when contracted by a pregnant woman, increases the possibility that the fetus may develop a birth defect?

A. AIDS B. chicken pox C. psoriasis D. mumps

ISLE 14.4: Somatosensory PathwaysClick on the above link to work though the ISLE activity.  Once you've completed the activity, navigate back and answer the following question.The dorsal column-medial lemniscal pathways cross to the side of the body opposite a sensation at a ______ level than do the spinothalamic pathways. The dorsal column medial-lemniscal pathways cross ______.

A. higher; at the medulla B. higher; within the spinal cord C. lower; at the medulla D. lower; within the spinal cord