How many calories do proteins have?

There are 4 Calories in a gram of protein, 4 calories in a gram or carbohydrates and 9 calories in a gram of fat.

Explanation:

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producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls