How are malignant tumors different from benign tumors?
Select one:
O a. Malignant tumors lose plasma membranes, and benign tumors continue to produce them.
O b. Benign tumors have totally normal features, and malignant tumors have totally abnormal features.
O c. Malignant tumors grow by expansion, and benign tumors grow by invasion.
d. Benign tumors retain parental cell functions, and malignant tumors lose parental cell functions.