[Solved] The reproductive advantage enjoyed by organisms best suited to a particular environment is known as A) erotic plasticity. B) exhibitionism. C) natural selection. D) the older-brother effect. PB2: PB2 often refers to a secondary or specific pushbutton in a system, indicating its role or position within a sequence of controls. Retentive On-Delay: A timing function in control systems that starts counting upon receiving an input signal and retains its timing value across power cycles, activating its output after a set delay. Nonretentive Off-Delay: null Retentive Timer: A type of PLC timer that retains its value even after the power is turned off or the controlling logic is no longer true.