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.
Extracts from this document... Photosynthesis AT1 Prediction The rate of photosynthesis will increase as the light intensity increases. Method Make the room dark as possible so light from windows do not influences the results Cut a piece of weed 10cm long Attach it to a paper clip at the uncut end so the weed is weighed down.