Aconcept 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."