This theory states that parts of the Earth's crust slowly drift atop a liquid core. Wegener froze to death while heading an expedition crossing the Greenland ice cap in 1930. This plant has a low, two-lobed trunk, and two large, straplike leaves that sprawl along the ground. The plant only produces two leaves, but the wind splits them into many segments. It has a large, deep taproot.
Welwitschia lives in coastal desert areas, gravel beds, rocky canyon walls, and open flats.
It derives its moisture from the morning fog. It has a life span of over 1,500 years. Williamsonia is an extinct plant that lived from the Triassic period through the Cretaceous period . Williamsonia had a long, thin, branching, woody trunk covered with spirals of broken-off leaf scars. WOOD Wood is the secondary xylem of gymnosperms and dicots , but the term wood is often applied to other xylem.