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Nutrient Density
Its energy is derived from the nutrients in the food it consumes.
The amount of oxygen that's consumed when you burn your food is an indirect measure of the amount of energy that's released from the food. Bomb calorimeters are sometimes used to measure the energy content in food.
They get food from humas (soil derived from partially decayed animals and plants) ...food gives energy to them.
Talking is powered by chemical energy derived from the food you've eaten.
Food energy is usually measured in calories.
the measure of energy from food
calories
a measure of energy from food
Energy human's get daily is derived from food. Food rich in carbohydrates provide more energy to sustain humans each day.
Calories
Calories are the standard unit.