The development of multicellular organisms likely originated

The development of multicellular organisms likely originated
 
  a. from colonies of unicellular organisms of the same species.
  b. from endocytosis of other cells followed by mitosis.
  c. from cooperation between different species of cells.
  d. from colonies of numerous species of cells.
  e. from endosymbiotic eukaryotes.

Question 2

Which feature of Archaea is shared with Bacteria but not with Eukarya?
 
  a. the sequestration of DNA into a nucleus
  b. the common occurrence of introns
  c. the chemical structure of the cell walls
  d. the plasma membrane structure
  e. a genome comprised of a single, circular molecule of DNA