5.Cancer cells behave differently than normal body cells. For example, they ignore signals that tell them to stop dividing. Which of the following
conditions will most likely cause a normal body cell to become a cancer
cell?
The environment already contains cancer cells.
The environment has an abundance of nutrients.
The environment contains signals that would tell the cell to stop dividing.
The environment contains mutagens that induce mutations that affect cell-cycle
regulator proteins.

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

Agene editing technology called crispr-cas9 uses cellular machinery to change the cell's genetic material. how might this technology be useful in treating diseases like cancer?

This is a biological reaction due to a stimulus. i need this quickly !