"a type of speciation that involves the development of several species, each adapted to a specific enviornment, is called"

The correct answer is adaptive radiation.

Adaptive radiation is the process by which a single specie or single ancestral lineage, goes through several or various speciation processes and then become adaptively specialized to a specific or particular environmental or ecological place.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.