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humans and all other organisms, can only live in oxygenated enviroments.

answer; i believe that the correct answer is (lung);

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.

the correct answer in apex is tissue development, i know because i just had this question