The embryo has all the basic organs and body parts (except male and female organs) at approximately how many weeks after conception

After the completion of first trimester that is 8 weeks of conception, the baby is almost 1 inch grown. At this stage, the baby is referred as fetus. At this stage, all the organs as well as limbs becomes visible except for the sex organs.

The heart of baby beats rhythmically. Eyes and the eyelids are completely visible. Both the forelimbs and the hind limbs are formed, and fingers buds are also visible.

At this stage, the fetus looks like a human. The umbilical cord is also clearly visible at this stage.

Hence, the correct answer is 8th week.

"a.) well–developed vascular system."