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.Know More
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).Learn more about Biology
Heterotrophs are organisms that obtain energy by feeding off of other organisms, because they are unable to make their own food. They are also called consumers.Full Answer >
In the trophic structure, classification of organisms in an ecosystem occurs through the energy source and consumption of food by an organism. The trophic structure represents the relationship between species and food sources.Full Answer >
Bacteria are simple organisms that are found in every type of environment, including on land, in the air, in water and on and inside plants and animals. A bacterium (or single bacteria) is a single-celled creature that can take many shapes and forms.Full Answer >
All living things require water, nutrients, air, sunlight and a proper temperature in order to live. The amount of each that is required and how each is acquired varies depending on the organism.Full Answer >