The definition of a concubine is a woman who is a mistress to a man with a wife or who cannot be married to her because of a difference in social status. An example of a concubine is one of the mistresses of an important king who has many wives and mistresses. concubine. concubine.
How do you identify a tree species? It is known that mature, leafy trees, such as redwoods, aspens and oaks, are the best producers of oxygen. Additionally, it is known that a tree produces higher volumes when growing than when mature, because converting air and soil into wood causes the tree to produce more oxygen.
One acre of trees annually consumes the amount of carbon dioxide equivalent to that produced by driving an average car for 26,000 miles.  A 100-ft tree, 18 diameter at its base, produces 6,000 pounds of oxygen.. On average, one tree produces nearly 260 pounds of oxygen each year.