Why are carbohydrates considered our most valuable energy source?

Why are carbohydrates considered our most valuable energy source?

Why are carbohydrates considered our most valuable energy source?  And, list all of the various  classifications and forms of carbohydrates found in your textbook and a food source for each individual carb.  What role does each carb mentioned play in nutrition?  Be detailed and specific.  Mine your textbook carefully and be thorough.   Do not do the above work in paragraph form.  Create a form or use an excel spreadsheet.