A difference between a stem cell and a progenitor cell is that a. progenitor cells are rare but stem cells are abundant b. a stem cell cannot self-renew and a progenitor cell can c. a progenitor cell...

A difference between a stem cell and a progenitor cell is that a. progenitor cells are rare but stem cells are abundant b. a stem cell cannot self-renew and a progenitor cell can c. a progenitor cell cannot self-renew and a stem cell can d. progenitor cells are not present in embryos by stem cells are