💫01
Fertilization
One sperm reaches the egg — and the egg blocks the rest.
Open →🌱02
Early Development
Cleavage, morula, blastocyst, and implantation.
Open →🧩03
The Germ Layers
Ectoderm, mesoderm, endoderm — and what each becomes.
Open →📆04
Fetal Development Timeline
The milestones of each trimester.
Open →👶05
Pregnancy & Birth
The placenta and the three stages of labor.
Open →🧬06
Inheritance
Build a Punnett square and predict the odds.
Open →