The organ system that consists of ductless glands that secrete hormones and the molecular receptors on target cells that respond to the hormones is known as the
(a) digestive system.
(b) respiratory system.
(c) circulatory system.
(d) endocrine system.
(e) nervous system.

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.

sorry, but you do not have posted the diagram.

so whats the answer