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)
The modern genetic definition of biological evolution is A. change from one species to another by the natural selection of individual variation B. mutation causes variation and variation is selected for by the environment C. survival of the fittest D. a change in allele frequencies from one generation...iological evolution is defined as the change in allele frequencies (where alleles are versions of the same gene that differ in their base sequence) within populations (Freeman and Heron, 2004) http://www.calstatela.edu/faculty/pnargu...