Fiber, and water. Fiber cannot be digested and provides no nutritive value. Water is necessary for life, however, it has no nutritive value.
Yes, it does produce heat energy.
Oxidation releases heat. Food is chemically oxidized by the body to produce carbon dioxide, water and heat. There are other chemical processes occurring but this is the primary source of heat from food.
Energy is the capacity to do work or to produce heat.
They convert sunlight into chemical energy.
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Heat energy is the amount of heat used to energize or to produce heat.
Heat itself is a form of energy, so no.
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heat energy
Heat is generally considered as a resultant of other energy reactions, which is why it is considered to be related to kinetic energy. All types of energy (the ability to do work) can produce heat energy.
Mechanical energy