Evolutionary history of plants phloem on the outside. Since xylem cells comprise dead, lignified tissue, subsequent rings of xylem are added to those already present, forming wood. The first plants to develop secondary growth and a woody habit, were apparently the ferns, and as early as the Middle Devonian one species, "Wattieza", had already reached heights of 8 m and a tree-like habit. Other clades did not take long to develop a tree-like stature. The Late Devonian "Archaeopteris", a precursor to gymnosperms which evolved from the trimerophytes, reached 30 m in height. The progymnosperms were the first plants to develop true wood, grown from
Seeds of Peace camp, they are they eyes and ears of the parents, of their communities; at the same time, they engage in an intense encounter experience of their own. After camp, they are invited to join the growing circles of support for Seeds of Peace. These many years of conflict resolution programming has produced an impressive cadre of Seeds working in international affairs, politics, business, medicine, nonprofit and media. Seeds of Peace also has offices in New York, Amman, Jerusalem, Lahore, Mumbai, and Otisfield. A core aspect of camp program is the daily facilitated dialogue program. During daily dialogue sessions guided by