Structure of Tree (1)

Trees have the longest lifespan of all the

higher forms of life. Perhaps the greatest

survivors among them are the bristcone pines

(Pinus longeava) of California's white Mountains.

One specimen there, known appropriately as Methuselah, is estimated to be around 5,000

years old: it was a mere seedling when

the Egyptians built their pyramids.

  All trees are classified as coniferous tree

and deciduous trees. Coniferous tree are also

know as evergreens. Deciduous trees will

drop their leaves in cold winter.