what do birds need energy molecules for
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Why organisms need energy
All organisms need energy to live. This energy is used: to drive the chemical reactions needed to keep organisms alive – the reactions to build complex carbohydrates , proteins and lipids from the products of photosynthesis in plants, and the products of digestion in animals, require
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flying birds need a lot of energy to power their flight, so they tend to eat more. Flight muscles consume a lot of energy to propel the bird in air. Their basal metabolic rate is also high, hence they use energy at higher rate (compared to mammals).
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