Answer:
the average reaction time is 0.25 seconds.
The correct answer is "absolute temperature".
In fact, Charle's law states that, for a fixed amount of gas kept at constant pressure, the ratio between the volume of the gas V and its absolute temperature T is constant:

And this equation can be also read as: when V changes, T changes by the same proportion, so this means that the volume V is directly proportional to the absolute temperature T of the gas.
With more genetic variations, the more adaptations will be developed that will help the population survive the changing environment.
For example, if an environment starts to grow lighter fields, a population will start to develop genetic variation that will help camouflage the animal. Like, make the animal start to have lighter skin to camouflage.