Estimation on the global photosynthetic productivity; Significance of the molecular oxygen released by photosynthesis; Evidence on the microfossil record of cyanobacteria.Des MaraisDavid J.ScienceDes Marais D. J. (2000) When did photosynthesis emerge on Earth? Science 289(1703-1705)....
and the petiole by which the leaf is attached to its branch. In the angle formed by the petiole and the branch, called theaxil, is a bud from which a fresh leaf will emerge next