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To get energy for bodily functions.
Electromagnetic energy
Our bodies need a fuel source. Sugars are very high in energy, and when broken down, we can use that energy to do bodily processes.
Everything living needs energy. Plants and animals need energy to carry out the daily activities of living. It takes energy to get more energy. Every bodily function requires energy.
To provide energy for movement, digestion and other bodily functions.
Physical Activity
Proteins can be matabolized as energy, but are used to build bodily tissues (such as muscles) and form important metabolic compounds.Some types of proteins store energy, but the main energy storage molecule is carbohydrates.
No. It is possible to have respiration in a pure carbon dioxide atmosphere and get no energy out of it. Respiration pulls oxygen into the system and it is the combination of this oxygen with other bodily chemicals that provides energy.
Physical activity
Physical Activity
radiant energy from the sun
all the above