Isotopes have the same but have a new atomic mass because they * number of electrons; have more or less neutrons number of protons; have more or less neutrons number of protons; have more or less electrons number of electrons; have more or less protons

An experiment is conducted to see if cats preferred skim milk or 2% milk. a cup of skim milkwas put out for 5 kittens and then measured how much the kittens drank over the course of aday. following a cup of 2% milk was purout for the skittens and then masured how much thekittens drank over the course of a day. the same kittens were used and the milk was served atthe same temperature. it was discovered that the cats liked the 2% milk more than the skimmilk. what is the dependent variable in this experiment?