<P> A fetus is a stage in the prenatal development of viviparous organisms . In human development , a fetus or foetus ( / ˈfiːtəs / ; plural fetuses or foetuses ) is a prenatal human between the embryonic state and birth . The fetal stage of development tends to be taken as beginning at the gestational age of eleven weeks , i.e. nine weeks after fertilization . In biological terms , however , prenatal development is a continuum , with no clear defining feature distinguishing an embryo from a fetus . The use of the term `` fetus '' generally implies that an embryo has developed to the point of being recognizable as a human ; this is the point usually taken to be the ninth week after fertilization . A fetus is also characterized by the presence of all the major body organs , though they will not yet be fully developed and functional and some not yet situated in their final anatomical location . </P>
<P> A fetus is a stage in the prenatal development of viviparous organisms . In human development , a fetus or foetus ( / ˈfiːtəs / ; plural fetuses or foetuses ) is a prenatal human between the embryonic state and birth . The fetal stage of development tends to be taken as beginning at the gestational age of eleven weeks , i.e. nine weeks after fertilization . In biological terms , however , prenatal development is a continuum , with no clear defining feature distinguishing an embryo from a fetus . The use of the term `` fetus '' generally implies that an embryo has developed to the point of being recognizable as a human ; this is the point usually taken to be the ninth week after fertilization . A fetus is also characterized by the presence of all the major body organs , though they will not yet be fully developed and functional and some not yet situated in their final anatomical location . </P>
​ which event is characteristic of the period of the fetus
​ which event is characteristic of the period of the fetus
the presence of all the major body organs
the presence of all the major body organs