The cell formed by the union of a sperm cell and an oocyte is called. a. blastula b. morula c. zygote d. blastocele e. b and c are correct The connecting stalk seen early in human development later become a. placenta b. amniotic sac c. umbilical cord d. yolk sac The earliest cavity is a. morula b. blastula developmental stage at which one can see a fluid-filled ex c. zygote d. fetus e. 4-cell stage The organ through which maternal and fetal blood exchange materials a. umbilical cord b. umbilical vein c. amniotic sac H. amniotic cavity . placenta The process by which a baby is born is called a. gestation pregnancy

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