Ciliated cells that line airways in lungs function to ________.

Ciliated cells that line airways in lungs function to ________.
 
  a. secrete mucus
 b. release carbon dioxide
 c. capture airborne particles
 d. absorb oxygen

Question 2

Why would researchers want to have both genomic libraries and cDNA libraries from a particular
  organism?
 
  a. The genomic library is generally too big to be helpful; a cDNA library, being smaller, is
  much easier to study.
  b. A cDNA library will be the same in every cell; the genomic library tells researchers which
  genes are being expressed in individual cell types.
  c. The cDNA library helps us understand how retroviruses work; the genomic library does
  not.
  d. The cDNA library is a lot easier to clone than a genomic library.
  e. A genomic library will be the same in every cell; the cDNA library tells researchers which
  genes are being expressed in individual cell types.