Why do living things need air, food and water?


Living things need air, food and water because they are essential to the chemical processes that provide organisms with energy and keep them alive. These processes are collectively known as metabolism. The nutrients found in food, the oxygen found in air and the solvent property of water are indispensable components of metabolism.

The biological functions that keep organisms alive are forms of work, and all work requires energy. Because energy cannot be created, living things have to obtain it from a source. That source is the food they eat. Food is filled with different chemical compounds that provide energy when chemically broken down. Individual nutrients perform specific functions within an organism. For instance, carbohydrates are the body's main source of fuel, fats are critical for cell structure and proteins help make hemoglobin.

Water is a solvent that is necessary for many chemical reactions in the body, including metabolism. It takes part in the breaking down of nutrients, but its importance is even more basic and far-reaching. Cell cytoplasm is mostly made of water. Without water, cells lose their structure and experience severe damage.

Air is important because it has oxygen, a critical component in cellular respiration, the metabolic process by which living things obtain energy. Organisms combine oxygen with glucose to produce ATP (energy).

Q&A Related to "Why do living things need air, food and water?"
Organisms need water, air, and living space so they can live and give us health. example:if we need water, air, and living space so that we can live organisms need it to so they can
All the living things do works and thus they need energy for the survival . This energy is supplied to them by the food, as they can't make their own they take it from others. This
Fish are alive and they do not need air. Your question is flawed. Try asking: Why do complex organisms require oxygen. Anonymous
not all living things need air to survive. do you like cakes? the yeast used to make them is a fungus that hates air and is a close relative to the yeast that gives us beer. many
Explore this Topic
Some of the things that all living things need to survive include food, shelter, clothing, air and water. They have a circle of life that is characterised by birth ...
Living things have basic needs such as sunlight, water, food, drink, health, and so much more. If a living organism is not given the proper necessities that it ...
The four basic needs of all living things are food, water, shelter and warmth. With all of those things, organisms are able to maintain homeostasis. ...
About -  Privacy -  Careers -  Ask Blog -  Mobile -  Help -  Feedback  -  Sitemap  © 2014 Ask.com