Softening the blow for hammerhead sharks and tropical hardwoods

What do spectacular sharks and a priceless tropical timber have in common? The answer is that they are in equally urgent need of conservation attention, and both stand to benefit from the intervention of the latest Conservation ...

The battle to save citrus fruits

Huanglongbing, (HLB), also known as citrus greening, has devastated Florida's citrus farms. Although some growers in China and Brazil have been able to control the problem, California groves are now threatened, according ...

New research shakes up the sloth family tree

New studies by two research teams published today in the journals Nature Ecology and Evolution and Current Biology challenge decades of accepted scientific opinion concerning the evolutionary relationships of tree sloths ...

Feathers came first, then birds

New research, led by the University of Bristol, suggests that feathers arose 100 million years before birds—changing how we look at dinosaurs, birds, and pterosaurs, the flying reptiles.

Team guides plants towards obtaining iron

A team at the University of Cordoba has examined the link between the presence of beneficial organisms in plant roots to their response to iron deficiency.

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Tree

A tree is a perennial woody plant. It is most often defined as a woody plant that has many secondary branches supported clear of the ground on a single main stem or trunk with clear apical dominance. A minimum height specification at maturity is cited by some authors, varying from 3 m to 6 m; some authors set a minimum of 10 cm trunk diameter (30 cm girth). Woody plants that do not meet these definitions by having multiple stems and/or small size, are called shrubs. Compared with most other plants, trees are long-lived, some reaching several thousand years old and growing to up to 115 m (379 ft) high.

Trees are an important component of the natural landscape because of their prevention of erosion and the provision of a weather-sheltered ecosystem in and under their foliage. Trees also play an important role in producing oxygen and reducing carbon dioxide in the atmosphere, as well as moderating ground temperatures. They are also elements in landscaping and agriculture, both for their aesthetic appeal and their orchard crops (such as apples). Wood from trees is a building material, as well as a primary energy source in many developing countries. Trees also play a role in many of the world's mythologies (see trees in mythology).

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