According to Charles Darwin's theory of evolution by natural selection, organisms that possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.
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Nucleic acids are known as DNA and RNA. they are essential for all cells, since it is through them that genetic information is stored and encoded. They are essential for the synthesis of proteins, carbohydrates, lipids and the regulation of intermediate metabolism, in addition to acting by activating or inhibiting enzymes.
It is responsible for your body's 'fight or flight' reaction it also looks after the workings of your body during rest and recuperation. It also controls your heart rate and body temperature under normal conditions.