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Home Q & A Board Biology-Related Homework Help General Biology
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sila sila
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6 years ago
Which type of defense mechanism is not classified as the first line of defense?
 
  a. Chemical barriers
 b. Skin
 c. Mechanical barriers
 d. Physical barriers
 e. Leukocytes

Question 2

Darwin calculated that if reproduction was not limited, a single pair of elephants could leave ____
  descendants after 750 years.
 
  a. 750
  b. 15,000
  c. 150,000
  d. 19 million
  e. 190 million
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m0502428m0502428
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6 years ago
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sila Author
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#2
6 years ago
All correct!
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