Name the ecological factor, changes in which during the year have the most significant

Name the ecological factor, changes in which during the year have the most significant direct impact on plants and animals living in mid-latitudes.

In middle latitudes, a complex effect of natural environmental factors is observed, and it is the temperature factor that has the greatest effect on biorhythms (it affects to a lesser extent life processes in endothermic organisms (they use the energy of internal processes to a greater extent), for exothermic ones (on the contrary, they receive heat from various external sources) is the determining factor); as well as the length of daylight hours.