Answer:
C. by causing mutations in genes
Explanation:
Smoke can induce mutations in genes causing tumors such as lung cancer
This would be the circulatory system, hope it helps : )
Answer:
This means that the amount of nitrogen excreted from the body is greater than the amount of nitrogen ingested.
Explanation:
A negative nitrogen balance can be used as part of a clinical evaluation of malnutrition. Nitrogen balance is the traditional method of determining dietary protein requirements.