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.
Adding plants to interior spaces can increase oxygen levels. At night, photosynthesis ceases, and plants typically respire like humans, absorbing oxygen and releasing carbon dioxide. A few plants â orchids, succulents and epiphytic bromeliads â do just the opposite, taking in carbon dioxide and releasing oxygen. Place these plants in bedrooms to refresh air during the night.