The answer would be a. cancer cells become invasive and grow into a body tissue. Apoptosis is a programmed cell death that certain cells undergo in order to protect the organism. However, sometimes these cells can avoid apoptosis and do not respond to signals to stop dividing (known as uncontrolled cell division); this results in a mass of extra cells (tumor) and that's how cancer happens. Hope this made sense :)
A downhill skier traveling down a hill has a large amount of kinetic energy because of their mass and high velocity.
Answer:
Agricultural research is your answer
Explanation:
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To my knowledge it would be during the development stages or if it were exposed to harmful chemicals. There could be mistakes made when the DNA is replicating- like cancer cells- multiplying when its not needed