Because each body system has a completely different function.
3 is the answer. This harms the lungs. Nicotine can cause lung damage less fast than tobacco.
Answer:
I am pretty sure that the correct answer is smallpox but I'm not too sure.
It is a tick disease so whenever the ticks are out people can get it. If you live in Northeastern United States these fall in Fall and Winter season when most people and animals get bitten.
<span>Bacteria that cause a urinary tract infection (UTI) make an enzyme that changes urinary nitrates to nitrites. Nitrites in urine show a UTI is present. Leukocyte esterase (WBC esterase). Leukocyte esterase shows leukocytes (white blood cells [WBCs]) in the urine.</span>
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