In the Following Example,what Is the Independent Variable? Hypothesis: Mice

Multiple Choice

In the following example,what is the independent 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 day of death (lifespan) is recorded for all mice.All mice live in the same room,in the same type of cage,with access to water.

A) amount of food available
B) volume of water available
C) genetically identical mice
D) happiness of each mouse
E) lifespan of each mouse