Because homeostasis is vital for survival, mechanisms have evolved that maintain a stable internal environment.

To maintain homeostasis, redundant mechanisms are present in the body so that when one of the systems fails, other complementary or backup systems can help to compensate and ensure the survive of the organism by maintaining homeostasis. Examples of these redundant systems involve blood pressure regulation, temperature regulation, breathing and pH control in the body during exercise.

i would have a lunch. it's one big package of food, making it one food. : p

allowed for the prediction of the properties of missing elements.