The term "cancer" is used to describe a group of diseases in which cells start dividing and invade healthy tissues and organs. these cancerous cells can through the blood or the lymphatic system. when the body is already weakened by disease, stress, or old age, the cancer invasion has more of a chance of succeeding. the rapid and abnormal growth of tissue is called

a. most tumors are not , but are . in the past, the only way to distinguish between the tumors was to perform

a. damaged dna can result in that lead to cancer. dna can be damaged by in the environment like radiation and toxic chemicals. other factors influence cancer risk as well. they include biological and genetic factors, exposure to infectious agents like viruses, and . submit