Answer:
They are small enough to fit through narrow vessels, have a thin membrane as well as a concave shape, allowing them to absorb gases like oxygen and such very easily.
I think metastasis is a secondary tumor in a different part of the body that arises from a cells from the primary tumor. Metastasis means the spread of cancer cells. Cancer cells may break away from a primary tumor and enter the bloodstream or lymphatic system and is then spread to other parts of the body.
C. data analysis.
I just took a test with this exact question and c was the correct answer
