Hydro electric ,thermal and nuclear energy
Glucose is considered a simple sugar. It is a primary energy source for the brain.
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Hydroelectric power
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primary
Carbohydrates are the body's primary and immediate source of energy.
Carbohydrates are the body's primary and immediate source of energy.
The term clean source of energy refers to only primary energy sources as wind or solar energy. Electricity, by definition, is not a primary energy source. It is a secondary energy source that is could be produced by a clean energy source as wind or any renewable primary energy source or produced by fossil energy source as oil, natural gas, or coal.
The Sun is the primary source of all energy on Earth.
Carbohydrates are the primary energy source for herbivores (cows, horses, etc.). Proteins are the primary energy source for carnivores (dogs, cats, etc.).
The sun is the initial (primary) energy source for life. Ingestion and digestion of a food source is an animal's primary source of energy.
The primary is the sun
Glucose is considered a simple sugar. It is a primary energy source for the brain.
the sun
the sun
Wood is the first discovered primary energy source. Some believe that Solar energy (as heat caused by sun light) is the first discovered primary energy source.