Blood is blue before it reaches oxygen. this is why your veins are blue
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).
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brainly.com/question/11710623
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