Cancer cells differ from normal cells in two important aspects:
a) a halting of all cell division and the ability to metastasize.
b) the ability to metastasize and contact inhibition.
c) apoptosis and contact inhibition.
d) loss of contact inhibition and the halting of all cell division.
e) indefinite cell division and the loss of contact inhibition.
Answer: e) indefinite cell division and the loss of contact inhibition.