Answer: Molecules
Step-by-step explanation:
Proteins, carbohydrates and lipids are some of the examples of macro molecules in the body. It helps in providing energy to the body.
The food that we eat daily contains carbohydrates, proteins and lipids. The first molecules that is used when energy is required is carbohydrates.
Once the carbohydrates is all utilized the second molecule used is protein which is found in the pulses and non-vegetarian diet that we eat.
The last source of energy is fat which is used at last when it comes to deriving energy.