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)
In this section, we define evolution as it is understood to modern biology and as it applies to ecology. Evolution is defined as the change in the inherited traits of a population of organisms through successive generations. When living organisms reproduce, they pass on to their progeny a collection of traits.