Explain how color and light can be when determining concentration.

Color and light are one of the important things and helpful in determining concentration as they are able to show basis of whether the concentrations you have used is correct and accurate as the original effect on the experiment being conducted. They were able to provide differentiation of experiments and to be able to show the differences and which are the ones who are accurate and precise base on the given results.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.