Evolutionary bioenergetic trap and progressive evolution of animals

We propose a macroscopic pathway to increase energy metabolism during progr essive evolution with reducing size of animal body. If standard metabolism significantly increases in the course of body size reduction through increa sed coefficient b from the allometric equation (1), two cases are possible: coefficient b remains constant (1) or returns to the normal value (2) at i ncreasing body weight in a given animal group. In the first case, an animal group appears in an evolutionary trap considering possible increase in bod y size, since the standard metabolism at increasing weight becomes lower st arting from a certain point as compared to other animals of the same type. In the second case, increasing body size elevates standard metabolism relat ive to other animals of the same type, which offers an evolutionary advanta ge to this group.