Which of the following stages starts the process of embryonic development?

• Fertilization

• implanation

• menstruation

• ovulation

The developing ball of cells that implants in the endometrium is called?

• zygote

• blastocyst

• embryo

• baby

Which of these three layers develop into the structure that insulates the developing embryo?

• Chorion

• amnion

• allantois

• trophoblast

The placenta forms out of which of the following layers?

• Amnion

• chorion

• allantois

• trophoblast

Which of these structures eventually forms the umbilical chord?

• amnion

• chorion

• allantois

• trophoblast

Which of the following hormones is produced by the chorion and assists in preventing miscarriages?

• FSH

• LH

• Estrogen

• hCG

The ectoderm develops into which of the following systems?

• nervous system

• skeletal system

• circulatory system

• digestive system

The endoderm would NOT develop which of the following organs?

• Lungs

• heart

• stomach

• intestines

Tags

NGSS.HS-LS1-4

The mesoderm develops into which of the following system(s)?

• Skeletal & Circulatory

• Reproductive

• Digestive & Respiratory

• Nervous System

Tags

NGSS.HS-LS1-4

By week 9 of the first trimester, what is the developing embryo now called?

• Baby

• infant

• fetus

• tiny alien