A phyloGENETIC tree is not the same thing as a taxonomic tree, which is what Cal described. rRNA and molecular studies are used in phylogenetics to determine relations between species.
1 As the light intensity increases, the rate of photosynthesis increases. 2  However, the rate will not increase beyond a certain level of light intensity. 3  At high light intensities the rate becomes constant, even with further increases in light intensity, there are no increases in the rate.
Light intensity, CO2 concentration, and temperature are factors that determine the rate of photosynthesis. Light intensity has no effect on the rate of photosynthesis. If the distance between the source of light and the plant is increased, the rate of photosynthesis will decrease. Light intensity has an impact on the rate of photosynthesis.