Which of the following is NOT a factor that makes cancer cells hard to treat? a. Cancer cells are outside invader cells that your immune system does not recognize.

b. Cancer cells have the ability to secrete their own growth hormone.

c. Cancer cells frequently undergo mitosis.

Need 5. reflection what factors did you use to determine the validity of your sources? (what was most important and guided your decision to determine validity? ) what factors did you use to determine the reliability of your sources? what was the most important and guided your decision to determine reliability? what form of media resources (internet, publications, music, advertisements, video, etc.) do you think were the most valid and reliable for your question? support your answer. what was your best source? support your answer.