Embryo
A developing individual from the end of the 2nd week of gestation (when the 3 primary germ layers have formed) through to the end of the 8th week (when all of the organ systems are present).
A developing individual from the end of the 2nd week of gestation (when the 3 primary germ layers have formed) through to the end of the 8th week (when all of the organ systems are present).