Which of these in a case of artificial selection

The answer would be c

Explanation:

because it's artificial it's not something that the cow already had. they added it to the calves

your best option is 5,000 kg

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.