Which of these four items provide 9 calories for every gram consumed?
a. simple carbohydrates
b. complex carbohydrates
c. proteins or
d. fats

D. Fats

Explanation:

Fats provides the most calories per gram as such every gram of fat contains nine calories. Fat posses more than twice as many calories per gram as in simple carbohydrates or complex carbohydrates and proteins. A gram of fat has about 9 calories, while a gram of carbohydrate or protein has about 4 calories.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.