When a dairy farmer chooses to breed the cows that give the most milk in the herd, the farmers are following the principle of:
a. artificial selection.
b. acquired characteristics.
c. descent with modification.
d. natural selection.

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.