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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.^[1] A minimum height specification at maturity is cited by some authors, varying from 3&_160;m^[2] to 6&_160;m;^[3] some authors set a minimum of 10&_160;cm trunk diameter (30&_160;cm girth).^[4] 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&_160;m (379&_160;ft) high.^[5]

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). As of 2005, there were approximately 400 billion trees on Earth, about 61 per person.^[6]

A tree is a plant form that occurs in many different orders and families of plants. Trees show a variety of growth forms, leaf type and shape, bark characteristics, and reproductive organs.

The tree form has evolved separately in unrelated classes of plants, in response to similar environmental challenges, making it a classic example of parallel evolution. With an estimate of 100,000 tree species, the number of tree species worldwide might total 25 percent of all living plant species.^[7] The majority of tree species grow in tropical regions of the world and many of these areas have not been surveyed yet by botanists, making species diversity and ranges poorly understood.^[8]

Tree Subcategories Tree Articles Eating Your Way To A Healthy Heart by Jeremy Seaver Heart disease is number one killer among both men and women in the United States. And though we all realize that eating nutrient-dense healthy foods help reduce the risk, we may not know which foods are the best choices to battle this deadly disease ... Strength Training & Yoga by jaffar aashik You can improve your appearance, strength muscle to fat ratio, and even your walking performance by adding strength training to your walking routine. Some benefits of strength training ... Body Fitness & Strength by jaffar aashik You may think fitness means going to the gym everyday after school. However, there are many different forms of physical fitness. It's not important what you do to stay fit, it's important that you do it regularly. If you are physically fit, you are f... A Tree for All Seasons by Terry Christensen Neem oil is high in vitamin E, rich in emollients and fatty acids that help to heal dry, damaged skin. Neem helps restore the skin’s natural elasticity. Its antibacterial properties help to fight against the bacteria that cause acne. Neem is also ant... Strength Training & Yoga by kannan kannan You can improve your appearance, strength muscle to fat ratio, and even your walking performance by adding strength training to your walking routine. Some benefits of strength training ... Body Fitness & Strength by kannan kannan You may think fitness means going to the gym everyday after school. However, there are many different forms of physical fitness. It's not important what you do to stay fit, it's important that you do it regularly. If you are physically fit, you are... Selecting Healthy Trees: Austin by Andrew Johnson When visiting the nursery, there are a few things to consider before you buy a tree. You may initially need to meet with a professional arborist to make a wise decision. An arborist will evaluate your soil to see if it is acidic or alkaline. They wil... Keeping Up With A Health Tree by Jess Shaw Making sure that your fruit tree stays healthy is very important, but not as hard as some might think. There are several vital things you need to do: don't harvest all of the fruit on the tree at the same time; make sure the soil is healthy; watch ou... Natural Remedies Explored - Acne by Philip Bailey The bane of many a teenager and unfortunately a few adults as well. Hormone changes in adolescence mean come what may, some teenagers will suffer. There are a plethora of skin care products out there, but keeping it simple and natural would ... Health benefits of Bonsai Plants by Hans Dekker Bonsai plants are unique, beautiful art forms. Those who own the trees and cultivate them are passionate about what they do. And that shows when people look at their amazing creations. Those who are investing in bonsai care are rewarded with more tha...