Answers (1) Jewels Vern. Energy is sometimes defined as capacity to do work. But work is defined as disordering energy. So energy is capacity to do disordering energy. That is a circular definition. Energy is not a physical unit. It is a philosophical concept and an accounting technique used to analyze mechanical and chemical exchanges. In nuclear physics it is defined as a wavelength of light, in biology it is a synonym for metabolism, and in public utilities they say energy when they mean connectivity. Anybody who uses the word in any other context does not know what he is talking about.
T he term species is defined as a group of organisms which interbreeds under natural circumstances, producing viable, fertile offspring, and which is reproductively isolated from other groups.This definition is known as the Biological Species Concept.hapter 4: Speciation and Phylogeny What is a species? The term species is defined as a group of organisms which interbreeds under natural circumstances, producing viable, fertile offspring, and which is reproductively isolated from other groups.
4) Competition species concept: Species are the most extensive units in the natural economy such that reproductive competition occurs among their parts (Ghiselin, 1974). 5) Ecological species concept: A species is a set of organisms exploiting (or adapted to) a single niche (Ridley 1993).) Isolation species concept: Species are systems of populations: the gene exchange between these systems is limited or prevented by a reproductive isolating mechanism or perhaps by a combination of several such mechanisms.