| A | B |
|---|
| Morula | 100 Cells |
| Blastocyst | Hollow Center |
| Embryo | An egg 2 weeks after conception |
| Yolk sac | Section filled with necessary nourishment for baby |
| Umbilical cord | provides oxygen and nourishment for the baby |
| Placenta | Nourishes the baby |
| amniotic sac | thin, fluid filled sac, provides cushion for the baby |
| basal metabolism | the rate at which you burn your food |
| fraternal twins | 2 eggs are released at the same time |
| identical twin | 1 egg and 1 sperm, fertilized egg seperates |
| obstetrician | a doctor who specializes in prenatal development and child birth |
| Fallopian tube | conception can only occur here |
| At the moment of conception, the _________ is determined | sex |
| A lab test shows pregnancy through excess _____________ in the urine | sex hormones |
| Vaginal secretions increase during pregnancy to protect against __________ | bacteria |
| The _______ is formed by the merging of the egg and sperm; then it divides itself over and over again | zygote |
| The process of growth before birth is known as _____ development | prenatal |
| At first the fertilized egg is treated like a(n) | enemy |
| Where the egg attaches itself to the uterine lining is by ________ | chance |
| From two weeks after conception until the end of the 8th week, the growing baby is called a(n)______ | embryo |
| The umbilical cord connects the fetus to the________ | uterus |
| Physical characteristics of the parents are passed on at conception by means of the ________ | DNA |
| On the 26th day the _____ appear | arms |
| On the 28th day the ____ appear | legs |
