The time of rapid growth of an organ system is called its period.

The time of rapid growth of an organ system is called its critical period.

   The critical period of development is used to describe the time during gestation when critical organ systems are formed. Also, critical period represents a development stage in the lifespan of an organism during which environmental stimuli has its greatest impact on an individual's development, especially on the nervous system.

Well, both latitude and intensity of light affect temperature because, the higher the light intensity, the higher the temperature and since latitude is the measure of how close you are to the equator, then the closer to the equator you are, the higher the temperature is.