Neater a house you should never be outside if a thunderstorm is close
Cell, tissue, organ, organ system, organism if that’s what you are referring to
When we talk about evolution we come across the process of natural selection. Genetic variation is always required for the natural selection. A change or variation in the genes may help the individuals in a population to better adapt to the environment. Such changes may be brought by mutations or random mating in the population. Such variations help in the survival of the population by allowing them to adapt to changing environmental conditions.
I am pretty sure the answer you're looking for would be Analog
I hope this helps:) Have a great day!!