Tree wiki:
>This article is about the biological organisms known as trees. For other meanings of the word see tree (disambiguation). A tree can be defined as a large, perennial, woody plant. Though there is no set definition regarding minimum size, the term generally applies to plants at least 6 m (20 ft) high at maturity and, more importantly, having secondary branches supported on a single main stem or trunk (see shrub for comparison). Compared with most other plant forms, trees are long-lived. A few species of trees grow to 100 m tall, and some can live for several thousand years.
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Arrow wiki:
>For other uses, see Arrow (disambiguation). An arrow is a pointed projectile that is shot with a bow. It predates recorded history and is common to most cultures. An arrow consists of a long and thin shaft made formerly of wood and now also from aluminium or carbon fiber composite. It is pointed or armed with an arrowhead at one end and with a nock or notch in the other. Arrowheads fit hunting and military purpose better than a mere point, which is mostly useful for target-shooting. Near the notch end are vanes which keep the arrow pointed in the direction of travel. There are often three vanes but many fletchings have four or even more. They were originally made from feathers but are now often made of plastic.
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