Research by Contemporary Neuroscientists Has Shown That

Multiple Choice

Research by contemporary neuroscientists has shown that:

A) precursor cells can replace damaged cells in a human spinal cord, thus restoring use of limbs.
B) severed spinal cord axons in an animal regrow if treated with certain nervous-system chemicals.
C) neurons in the central nervous system cannot regenerate and grow back.
D) no new central nervous system cells are produced after infancy.