Source+11

Van Camp, J. C. (2011). //Applying Ethics: A Text with Readings // (Tenth ed.). Boston, MA: Wadsworth, Cengage Learning.
 * 1) An ovum is the female reproductive cell.
 * 2) A spermatozoon is the male reproductive cell.
 * 3) Fertilization, or conception, is when the sperm enters the ovum.
 * 4) A zygote is a single cell that is created from conception and contains a complete genetic code.
 * 5) A zygote lasts from the first day of pregnancy to the third day.
 * 6) A blastocyst is a sphere of cells that surround a hollow, liquid-filled cavity.
 * 7) A bastocyst lasts from the second or third day through the second week.
 * 8) An embryo is more developed, and has developed organ systems and developed features.
 * 9) An embryo lasts from the third week through the eighth week.
 * 10) After this point, the entity is referred to as a fetus, which lasts from the ninth week until birth.
 * 11) Quickening is when the mother starts to feel the kicking of the fetus.
 * 12) Viability is the ability of the fetus to survive outside of the womb.
 * 13) Quickening occurs from the thirteenth week through the twentieth week.
 * 14) Viability starts around the twenty-fourth week.
 * 15) Brain activity usually becomes detectable in the eighth week.