Consider the following tree diagram: 
Which of the following nodes are parent nodes?
Definitions:
Carbohydrates
Organic compounds, including sugars, starches, and celluloses, that are a major source of energy for the body.
Lipids
A broad group of naturally occurring molecules that include fats, waxes, and certain vitamins, playing crucial roles in the structure and function of living cells.
Calorie
A unit of energy measurement used to quantify the amount of energy derived from food consumed by an organism.
Carbohydrate
Organic compounds, consisting of carbon, hydrogen, and oxygen, that are broken down to release energy in the human body, including sugars, starch, and fiber.
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