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. natural selection.
c. descent with modification.
d. acquired characteristics.

Well, i took the test and i put artificial selection and got it right. The definition of artificial selection is "The breeding of plants and animals to produce desirable traits" So the answer is A

on the planet jupiter, the acceleration due to gravity is approximately 26 m s2 , roughly 2.7 times the acceleration due