Much of the coordination of vertebrate body functions via chemical signals is accomplished by the .

Much of the coordination of vertebrate body functions via chemical signals is accomplished by the brain

Explanation:

The central nervous system which makes up the brain and spinal cord coordinates body functions of vertebrates via chemical signals through the nerve cells

the endomembrane system i think

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.