Abiology student wants to conduct a study of how much sunlight affects the length of sleep for mice. she sets up four cages with a mouse in each cage. what are the independent variable, dependent variable, and constants?

The independent variable would be the amount of sunlight because that is what you are testing and the dependent variable would be the length of time the mice slept because it is what you are measuring. The constants would be everything else water, food, cage size, exercise wheel, and temperature because they stay the same.

Nonmetals usually react by gaining electrons