Which statement best describes the amount of catalyst that remains at the end of a reaction?

a) more catalyst is present at the end than at the beginning of the reaction.
b) less catalyst is present at the end than at the beginning of the reaction.
c) the amount of catalyst is the same at the end as at the beginning of the reaction.
d) the catalyst is consumed by the reaction, so none remains at the end of the reaction.

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?