The consumed food first need to be physically broken and after that chemically. The energy stored in food (food contains carbohydrates, fats, proteins, water, vitamins, and minerals) is released when chemical bonds of molecules in food are broken in metabolic processes such as cellular respiration. Cellular respiration might be aerobic (involves the chemical reaction of food molecules with molecular oxygen) or anaerobic (without additional oxygen).
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- Predators for the wildebeest decreasing
- Food for the wildebeest increasing
- Water for the wildebeest increasing
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Photosynthesis converts carbon dioxide and water into oxygen and glucose. Cellular respiration converts oxygen and glucose into water and carbon dioxide.
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A command economy is a system where the government, rather than the free market, determines what goods should be produced, how much should be produced, and the price at which the goods are offered for sale. It also determines investments and incomes. The command economy is a key feature of any communist society.
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