Jenny underwent a surgical procedure during the twentieth week of her pregnancy in which the doctors inserted a needle into her amniotic sac through her abdomen and withdrew some fluid. the fluid was then studied for any abnormalities such as signs of down syndrome and spina bifida. in this scenario, jenny underwent a procedure known as

Jenny underwent a prenatal test or procedure known as Amniocentesis.  The small amount of amniotic fluid (less than one ounce)  removed from the sac surrounding the fetus is then sent to the laboratory for analysis.  Prior to amniocentesis, a complete anatomical ultrasound should be done to patient. 

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.