The occurrence of human identical twins is evidence that:a. all human cells are totipotent. b. no ...

The occurrence of human identical twins is evidence that:a.
   all human cells are totipotent.
  b. no human totipotent cells have been identified.
  c. the only totitpotent human cell is the one-cell embryo.
  d. cells in a two-cell human embryo are totipotent.
  e. cells in a two-cell human embryo are pluripotent.

Question 2

Cells become progressively committed to specific patterns of gene activity and developmental fate through a process
  known as:
  a. morphogenesis.
  b. determination.
  c. cell differentiation.
  d. pattern formation.
  e. growth.