What happens during angiogenesis in cancer development?
A. The proto-oncogenes in a single cell mutate to initiate uncontrolled cell division.
B. Blood and lymphatic vessels penetrate the tumor to supply it with oxygen and nutrients.
C. Cancer cells break away from the original tumor and invade other body parts.
D. Precancerous cells multiply while being encapsulated in the original tissue.
E. Cancer cells produce chemicals that kill the surrounding blood and lymphatic vessels.
Answer: B
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