Which of the following correctly explains why life processes such as nutrition, respiration, transport and excretion are essential for living organisms?
They maintain homeostasis and provide energy.
Life processes together keep the internal environment of an organism stable, a state biologists call homeostasis, and they supply the chemical energy every cell needs.
Nutrition brings in food, respiration releases energy from it, transport carries nutrients and gases to cells, and excretion removes wastes that would otherwise disturb the internal balance.
They are not restricted to plants because animals, fungi and microbes carry them out as well, and they are strongly interlinked rather than independent.
They support far more than growth and reproduction; even a resting body needs them to stay alive.
Hence, life processes maintain homeostasis and provide energy.
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Tooth decay starts when the pH of our mouth is_______.
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