human embryos
- fetusGestating offspring
- wombFetal development organ
- conceptionFormation of an idea
- cellsBasic biological units
- developmentProgress toward maturity
gestation · implantation · blastocyst · fertilization · IVF · stem cells · umbilical · placenta · pregnancy · zygote · uterus · trimester · genetic · chromosomes · dividing · heartbeat · ultrasound · amniotic
developmental stage
human embryossenior citizens
Older adults, typically retired
adults · elderly · adolescents · newborns · the elderly