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It is estimated that there are just over 3 trillion mature trees in the world.
A tree typically has many secondary branches supported clear of the ground by the trunk.
In looser definitions, the taller palms, tree ferns, bananas and bamboos are also trees.
Trees have been in existence for 370 million years.
Because this growth ruptures the epidermis of the stem, woody plants also have a cork cambium that develops among the phloem.
The cork cambium gives rise to thickened cork cells to protect the surface of the plant and reduce water loss.
Most angiosperm trees are eudicots, the "true dicotyledons", so named because the seeds contain two cotyledons or seed leaves.
For most trees it is surrounded by a layer of bark which serves as a protective barrier.Trees and forests provide a habitat for many species of animals and plants.Tropical rainforests are among the most biodiverse habitats in the world.The shoots typically bear leaves, which capture light energy and convert it into sugars by photosynthesis, providing the food for the tree's growth and development. Flowers and fruit may be present, but some trees, such as conifers, instead have pollen cones and seed cones.Palms, bananas, and bamboos also produce seeds, but tree ferns, produce spores instead.