1. Infected needles
2. Insect bite
3. Organ transplant
4. Blood transfusion
Answer:
the only answer that makes sense to me is C.
Tumors are groups of metastatic cells that may be benign or malignant cells. It is a distinctive feature of cancer.
<h3>Cancer and tumors</h3>
Cancer is a multifactorial disease characterized by the emergence of metastatic cells that proliferate in an uncontrolled manner to form a tumor.
There are situations where cancer only can be diagnosed by obtaining a small tissue sample, which is known as a biopsy.
Cancer can be classified as benign cancer or malign cancer depending on the proliferative nature of cancer cells and their ability to produce metastasis (malignant cells produce metastasis).
Learn more about cancer here:
brainly.com/question/11710623
