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fossil water – groundwater that has remained in an aquifer for thousands or millions of years; when geologic changes seal the aquifer preventing further replenishment, the water becomes trapped inside and is then referred to as fossil water. Fossil water is a limited resource and can only be used once.
The feeding relationships between different species in a given ecosystem. Also called a food chain, food network, or trophic social network. weed A plant growing where it is not wanted, often at a high rate of dispersal. wetland A type of ecosystem consisting of land permanently or seasonally saturated with water; the habitat of aquatic plants ...
The collection differs from a set: all the objects must coexist and have some physical relationship. [2] In other words, it is a portion of the physical universe chosen for analysis. Everything outside the system is known as the environment, which is ignored except for its effects on the system. The split between system and environment is the ...
A word identifying a person or a group of people in relation to a particular place, usually derived from the name of the place (which may be any kind of place, formal or informal, of any size or scale, from a town or city to a region, province, country, or continent) and used to describe all residents or natives of that place, regardless of any ...
Most societies traditionally use bowls or dishes to contain food to be eaten, but while some use their hands to deliver this food to their mouths, others have developed specific tools for the purpose. In Western cultures, cutlery items such as knives and forks are the traditional norm, while in much of the East, chopsticks are more common.
Also narrow. A land or water passage that is confined or restricted by its narrow breadth, often a strait or a water gap. nation A stable community of people formed on the basis of a common geographic territory, language, economy, ethnicity, or psychological make-up as manifested in a common culture. national mapping agency A governmental agency which manages, produces, and publishes ...
Dogs can understand that certain words refer to specific objects, according to a recent study, suggesting that they may understand words in a similar way to humans.. It offers the first evidence ...
A bubble of exhaled gas in water. In natural language and physical science, a physical object or material object (or simply an object or body) is a contiguous collection of matter, within a defined boundary (or surface), that exists in space and time.