You'll find sagging floors primarily on poorly constructed homes, raised framed foundations or on homes built before the late-1940s post-war boom. With age or termites, support joists can weaken or posts sink into the ground, especially when only supported by a pile of rocks or bricks.
âº a gradual process of change and development. âº biology Evolution is the process by which the physical characteristics of types of creatures change over time, new types of creatures develop, and others disappear. (Definition of âevolutionâ from the Cambridge Academic Content Dictionary Â© Cambridge University Press)
Evolution is the gradual genetic change of living organisms over time due to ecological pressures they experience. Individuals in an interbreeding population share in a common gene pool. A populationâs gene pool evolves, not an individual, due to changes occurring in such a gene pool. Evolution can occur in several different ways: (1) gene frequencies may be changed by migration, gene flow from another population.