To reach closer to the sun, so their leafs could grab more sun. As a method of survival between other trees. It would take a tree more effort to sprout up millions of branches from the ground, than sprout up one giant stem and from the stem grow the branches.
That's the way nature made it.
Yes, trees have thick woody stems. How tall depends on variety of tree.
Trees have got thick stems
Yes, trees tend to have woody trunks.
Trees would be a good example
trees
It is most water soluble
they have little stems they hold them on the tree and that's how they stay
Usually a tree is a single stem and a shrub is multistemmed.
herbs vines trees shrubs
they have many stems rising fronm the ground
When speaking about trees, the stem refers to the trunk. Another term for a tree's trunk which is commonly used is the word bole.
leaves, succulent stems and fruits - from trees, shrubs, and grasses. For The Sourcehttp://j.mp/RbxDEATH