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.
Any change in the level of a limiting factor will affect the rate of. reaction. For example, the amount of light will affect the rate of photosynthesis. If there is no light, there will. be no photosynthesis. As light intensity increases, the rate of photosynthesis will increase as long. as other factors are in adequate supply. As the rate increases, eventually another factor will come. into short supply.