Flashcards in Module 8 Deck (5)
A single sperm cell penetrates the outer coating of the egg and fuse to form one fertilized south.
Fertilized sell with 100 cells, which become increasingly diverse. At about 14 days the zygote turns into an embryo.
Chemicals or viruses that can enter the placenta and harm the developing fetus.
A branch of psychology that studies physical, cognitive, and social change throughout the lifespan.