A(n) further develops the organs and systems that existed in rudimentary form in the embryonic stage.

The answer is Fetus.

Explanation:

Human embryonic development refers to the development and formation of the human embryo. A developing human is referred to as Embryo during 3-8 weeks, and Fetus the ninth month of gestation until the birth. At the end of the 8th week after fertilization- embryo is considered a fetus. During this stage, the following are markers during pregnancy:

•    By 12 weeks of pregnancy, The fetus is filled with the entire uterus.

•    By about 14 weeks,  sex can be identified a child.

•    By about 16 to 20 weeks, the pregnant woman can feel the fetus moving. Women who have been pregnant before feeling movements about 2 weeks earlier than women who are pregnant for the first time.

•    By about 24 weeks, The fetus has completely ready for survival outside the uterus.

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

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