human
I'm a little confused about what the difference is between a fetus and an embryo. Can you help?
assistant
A fetus is an unborn baby that has developed enough to be considered alive, while an embryo is a fertilized egg that hasn't yet been implanted in the uterus. Fetuses are usually referred to as "unborn children" or "unborn babies", while embryos are often called "early fetuses" or "pre-fetuses".