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.
"Neurons" are the functional unit of the nervous system; it is the specialized cells transmitting nerve impulses
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you need the organisms in order to get help on this
