Mice are able to reproduce monthly once they reach the age of maturity. This adaptation increased their fitness because it allows for many chances to pass on genetics from one generation to the next. Some studies have also shown that mice developed a tan fur which probably helps with camouflage, contributing to their longevity as opposed to black fur.
Heterotrophs :) I'm pretty sure
The ammount of energy is changed because at that stage less energy is produced. Have in mind that as wavelenght increases the amount of energy decreases. For example, violet light has more energy than red light because violet light has a shorter wavelenght and red light, on the contrary, has a longer wavelenght