The answer is “True”
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In adrenocortical insufficiency, such as Addison's disease, the most severe manifestations are the result of an insufficient amount of circulating cortisol.
Addison’s disease is an uncommon chronic condition in which the adrenal glands fail to produce sufficient amount of hormones including cortisol and aldosterone. It results often from an autoimmune attack.
Cortisol is a hormone which assists the body in dealing with stress such as the stress of an illness, injury or surgery. It also helps in regulating the blood pressure, cardiac function, immune system and blood glucose or sugar levels.
Aldosterone is a hormone which affects the balance of salts like sodium and potassium in the blood which in turn controls the amount of fluid that the kidneys can remove as urine.
To learn more about Addison's disease here
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Answer: No
Explanation: It is beneficial if the animals that are disadvantageous doesn't reproduce so it doesn't discredit natural selection. The traits in which variation is occured are more suitable for organism to live and reproduce in the environment are preserved and are passed from generation to generation.
However, natural selection effects limited number of progeny.
Cancer<span> can </span>start<span> when just one of them </span>begins<span> to grow and multiply too much. The result is a growth called a tumor. Benign tumors are localized growths - they only cause problems if they put pressure on nearby tissues, such as the brain.</span><span />