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In this experiment, Escherichia coli with the best, unhindered growth rates were chosen and cultivated in NA and NB culture medium. The growths of these bacteria were measured after exposure to Ampicillin. This showed that E. coli behaved in two different ways: increasing (A) or decreasing (B) the growth rate. Then, the addition of Hydrogen Peroxide showed that group A did not grow very well while group B grew relatively well (earned resistance to Hydrogen Peroxide). These bacteria were, then, exposed to Streptomycin: high growth of B showed that it earned resistance again while A did not grow as well. Inoculation of normal E. coli, into NB solutions in which A and B had separately been cultured, indicated that B consumed a lot less nutrients compared to the A: stating that the B used a lot less energy compared to the latter. When B was mixed with the E. coli with A, B could change its behaviour like that of A. Then these E. coli, which had lost their resistance to antibiotics, were put back under a stressful condition; they once again separated into A and B. Overall, it could be observed that E. coli do not adapt to their environment according to their genetic materials but rather adapt to their environment by altering (which happens at random) their rate of energy usage, helping them to pursuit different behaviours in order to survive.