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Home Q & A Board Biology-Related Homework Help General Biology
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petrajanejob petrajanejob
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6 years ago
Tobacco smoke:
 
  a. exposes the smoker to less than 10 carcinogens
  b. presents more of a risk to male smokers than to female smokers
  c. takes a long time to manifest in a decrease of respiratory function
  d. increases respiratory infections
  e. increases carbon dioxide blood levels but decreases carbon monoxide blood levels

Question 2

A closed circulatory system is seen in:
 
  a. leeches only
  b. roundworms only
  c. flatworms only
  d. cnidarians only
  e. both earthworms and leeches
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jen2585jen2585
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6 years ago
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petrajanejob Author
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#2
6 years ago
Exactly what I needed for my quiz Smiling Face with Open Mouth
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