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 Hope Seeds of Hope Seeds of Hope was a plowshares group of women who damaged a BAE Hawk fighter jet at the British Aerospace Warton Aerodrome site near Preston, England, in 1996. As they stated in the explanatory video film left in the aircraft after their attack, they wanted to inspire hope instead of violence and greed, hence their choice of name. The group was also called the "Warton Four." On the 29 January 1996, Andrea Needham, Joanna Wilson and Lotta Kronlid broke into BAe's Warton Aerodrome at Warton and caused £1.7m worth of damage to BAe Hawk tail number ZH955,