In the following example, what is the DEPENDENT variable?
Hypothesis: Mice on a restricted low-caloric diet will live longer than mice that can eat as much as they want.
Experiment: A large population of genetically identical mice is divided into two groups. Half receive as much food as they care to eat each day. The other half receive 20% less food than a typical mouse eats each day. The lifespan is recorded for all mice. All mice live in the same room, in the same type of cage, with access to water.
Question 1 options:
genetic background of the mice
volume of water available
amount of food available
lifespan of each mouse