A pregnancy lasts for 40 weeks, The weeks are grouped into three trimesters, The second Trimester includes weeks 13 through 27 of a pregnancy.
In the second Trimester the baby grows larger and stronger and many women begin showing a larger belly. Most women find the second trimester is a lot easier than the first.
When the second trimester starts the baby is about 3 inches long. At the beginning of the second trimester the baby's head is the biggest part of his or her body. During the next weeks the rest of the baby's body will get longer in order to catch up . By the end of the second trimester the baby may be 9 inches longer or longer. The baby will start to hear certain sounds, like the mother's heartbeat. The baby's hearing will continue to improve. The baby will have fingerprints and footprints by the end of the second trimester, Fine hair, and a white waxy substance cover and protect the baby's skin. The skin is thin, loose, and wrinkled. By the third trimester fat will start to fill in under the skin. The baby's digestive system will start to function, the baby will also begin to produce and release urine, which becomes amniotic fluid. By the middle of the second trimester the baby's sex should be clear.
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Answer:
About 5billion years ago is the correct option.
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Organ System, Organ coll, tissue
