A concept map of evolution. Darwin's theory of evolution is biology's core theme that accounts for life's unity seen in DNA and common genetic code and target A seen in three domains and many kingdoms. The theory of evolution proposes a mechanism labeled as target B that is based on two observations and two interferences. Two observations are overproduction of offspring and target E. Two interferences are target F and target G. Feature of individuals labeled as target F best suited to the environment that leads to gradual accumulation of target G. The theory of evolution states that target C represents descendants of target D."