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How do animals obtain the nitrogen they use to make proteins and nucleic acids? A. by consuming plants or other animals B. by absorbing ammonia from bacteria growing in the roots of plants C. by breathing the nitrogen present in the atmosphere D. by absorbing nitrogen found in the soil
The answer is A. by consuming plants or other animals. Organisms need nitrogen to make proteins and DNA. However, they cannot directly use nitrogen from the atmosphere. Thus, choice C. is incorrect. Most plants absorb ammonia from bacteria growing in the roots or from the soil. On the other hand, animals get nitrogen by consuming plants or other animals.
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