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Home Q & A Board Biology-Related Homework Help General Biology
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teysha teysha
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6 years ago
A normally harmless substance that produces an immune response in some people is a(n):
 
  a. pathogen
  b. cytokine
  c. histamine
  d. allergen
  e. antibody

Question 2

Which statement most accurately describes the deuterostomes?
 
  a. The first opening on the embryo surface becomes the mouth.
  b. Their food and wastes enter/exit through the same body opening.
  c. They have an incomplete digestive system.
  d. They all have radial symmetry.
  e. Their mouth develops from the second embryonic opening and the first opening becomes the anus.
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Roshni411Roshni411
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6 years ago
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teysha Author
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#2
6 years ago
Thanks ... 100% Correct  Thumbs Up Sign
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#3
6 years ago
You're very welcome
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