Calories are energy, organisms eat foods, foods hold calories, so yes. Yes they can.
Regular calories are better. You need calories to survive, you don't need that much fat (consumed fat, that is) to live.
Mutualism occurs when organisms need protection (e.g., "guest defenders" or "guest cleaners"), when immobile organisms need to reproduce (e.g., pollinators or seed dispersers), and when organisms need to expand tolerances.
All organisms need oxygen to live.
you need 7000 calories to lose 1 kg
He doesn't need any calories. He has 3 SuperBowl rings.
we need calories for energy, for your body to move. Your heart and lungs need energy to function, as does your brain and all of your organs.
About 2,000 calories or so.
Girls (teenage) : need about 1800 to 2200 calories each dayBoys (teenage) : need about 2200 to 2800 calories each dayThe extra calories may be stored as fat. Individuals vary greatly in their ability to metabolize extra calories and/or fat.
1,600 calories for a woman, 2,000 calories for a man.
Not every organism need organs.Unicellular organisms do not have any way.
2000 to 2500 calories! they need to grow at these age! :]