A tree is a perennial plant with an elongated stem, or trunk, supporting branches and leaves in most species. They represent the largest and often oldest plants in a fully-developed ecosystem, requiring significant support and time to grow but returning that with proportional animal support and oxygenation.

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There are 3 trillion trees in the world now, and some 1 to 5 billion are cut down each year.

Phyla
Aquatic Micro-Organisms Archaea · Cyanobacteria · Diatom · Plankton
Algae Stonewort · Green Algae · Kelp · Seaweed
Aquatic Animals Coral · Crustacean · Fish · Mammal (Aquatic) · Reptile (Aquatic)
Terrestrial Micro-Organisms Actinobacteria · Lichen · Fungus · Protozoa
Plants Grass · Moss · Shrub · Tree
Terrestrial Animals Amphibian · Bird · Insect · Mammal (Terrestrial) · Reptile (Terrestrial)
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