Answer:
The answer is "The different types of light".
Explanation:
It sounds exactly like a variable. It is a variable existing independently which is not modified by one of the other variables that attempt for calculation. For example, the age of anyone could be a significant change.
- It is used to modify in a scientific experiment is also an underlying factor. It forms the cause of a result.
- All variables which the experimenter adjusts to test its dependence factor are separate variables, that's why the second choice is correct.
