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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 estimated 60,000-100,000 species, the number of trees worldwide might total twenty-five per cent of all living plant species.
Trees growing in arid and/or cold environments do so especially slowly. Thus, tree trunks and branches can remain on the forest floor for long periods, affecting such things as wildlife habitat, fire behaviour, and tree regeneration processes. Some trees leave behind eerie skeletons after death.
Most trees have roots near the surface because there are insufficient nutrients below the surface; most of the trees' minerals come from the top layer of decomposing leaves and animals. On younger substrates, especially of volcanic origin, tropical soils may be quite fertile.
A full-grown tree produces about 100 kilograms (220 lb) of net oxygen per year. [44] Acting as a carbon sink. Therefore, they are necessary to mitigate climate change. [45] Aiding in regulating climate. For example, research from 2017 shows that forests induce rainfall.
The story is commonly recognized as a fable concerning the danger of human's greed causing destruction of the natural environment, using the literary element of personification to create relatable characters for industry (the Once-ler), the environment (the Truffula trees) and environmental activism (the Lorax). The story encourages activism ...
Elm trees (Ulmus) and willows (Salix) can also be found dispersed throughout the temperate deciduous forests of the world. [1] While a wide variety of tree species can be found throughout the temperate deciduous forest biome, tree species richness is typically moderate in each individual ecosystem, with only 3 to 4 tree species per square ...
Pages in category "Documentary films about forests and trees" The following 18 pages are in this category, out of 18 total. This list may not reflect recent changes .
Saving Planet Earth is a season of nature documentaries with a conservation theme, screened on BBC Television in 2007 to mark the 50th anniversary of its specialist factual department, the BBC Natural History Unit.