Natural selection is the key mechanism of evolution and accounts for the commonality and diversity in nature. Can you give a specific example of a successful species and unsuccessful species adapting and not adapting respectively to their environments and why their adaptations or lack of made it so?

How can having high levels of serum sodium ions (high salt diets) contribute to the disease of hypertension (high blood pressure). Describe how these high levels of sodium ions can increase blood volume resulting in a rise in blood pressure.