Put the following stages of development in order...
a. Blastocyst implants in uterus,
b. zygote forms,
c. heart begins beating,
d. lungs can breathe air,
e. sex organs become visible

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.