When a heterotroph takes in food, only a small percentage of the energy in that food is used for growth, because a. some food is not digested and is eliminated as feces. b. some metabolites are excreted as urine. c. some energy is given off as heat. d. All of these are correct. e. None of these are correct
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When a heterotroph takes in food, only a small percentage of the energy in that food is used for growth because a. some food is not digested and is eliminated as feces. b. some metabolites are excreted as urine. c. some energy is given off as heat. d. All of these are correct. e. None of these are correct.
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Of the total amount of energy that passes from one trophic level to another, about $10 \%$ is a. respired and becomes heat. b. passed out as feces or urine. c. stored as body tissue. d. recycled to autotrophs. e. All of these are correct.
When you eat food, it is vital that the nutrients be absorbed. How does absorption occur? a. Food is mechanically and chemically broken down into smaller molecules. b. Alternating waves of muscular contraction facilitate movement of food. c. Partially digested food flows into the small intestine and food regurgitation is prevented. d. Nutrients diffuse across the intestines.
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