When cancer cells enter the lymph or blood system, they can form secondary tumours elsewhere.
<span>Secondary tumours are actually metastasis, cancer that spreads to a different part of the body from where it started. This happens when cancer cells break away from the main tumour and travel via blood or lymphatic system to other certain parts of the body. It is more difficult to treat metastasis because it is not always the same type of an original tumour.</span>
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Answer
white blood cells are immune system cells that protect the body against disease and foreign invaders they’re generally the largest cell types found in the blood
No because we dont, it is a rare phenomenon where some animals eyes seem to glow in the dark