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Just three crop species—rice, wheat, and maize (corn)—provide about 95 percent of human food energy needs. These staples are essential for the diets of billions of people worldwide, making them critical for food security. Their dominance highlights the importance of agricultural diversity and resilience in global food systems.
Less than 1 percent of the world's commercial energy is supplied by geothermal energy. This renewable energy source harnesses heat from the Earth's interior to generate electricity and provide direct heating. Despite its sustainability and low emissions, its contribution remains minimal compared to fossil fuels and other renewable sources like solar and wind.
provide energy to the cells
The Ten Percent Law refers to the transfer of energy from one trophic level to another.
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Carbohydrates..they provide energy
Carbohydrates
In the US, 19 percent of electricity. World-wide about 16 percent
The main compounds that serve as the cell fuel supply and provide energy for living things are carbohydrates, such as glucose. These compounds are broken down through cellular respiration to produce ATP, which is used as the main source of energy for various cellular processes.
Carbo-hydrates (sugars).
Structural compounds like cellulose, chitin, and collagen are organic compounds found in living things that are not energy-rich. These compounds provide support and structure for cells and tissues but do not serve as a primary energy source through metabolism.
Lipids are the class of organic compounds that store energy as fat in living organisms. They consist of molecules such as fats, oils, and waxes that are insoluble in water and contain long hydrocarbon chains. Stored fats can be broken down to provide energy when needed by cells.
The light reactions of photosynthesis produce energy-rich compounds like ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate). These molecules carry and provide energy for the subsequent dark reactions of photosynthesis.
Fossil fuels are naturally occurring compounds that undergo combustion, releasing energy in the form of heat and light when burned. This energy is harnessed and used for various purposes, such as heating, electricity generation, and transportation.
Gasoline is a mixture of hydrocarbons. As gas is burned, the compounds are broken down into simplier compounds and the breaking of these compounds releases energy.
The energy stored in compounds and released in reactions is chemical energy. It is released when chemical bonds are broken during a reaction, resulting in the formation of new compounds.