Normal cells become cancer cells when a. cells do not respond normally to control mechanisms.
b. regulation of cell growth and division is lost.
cells continue to divide without passing through G1.
d. All of the above

What is the main difference between the central nervous system (cns) and the peripheral nervous system (pns)? .the cns involves the brain and spinal cord, and the pns involves the body nerves. the cns involves the body nerves, and the pns involves the brain and spinal cord. the cns involves sensory neurons, and the pns involves motor neurons. the cns involves motor neurons, and the pns involves sensory neurons.