Blood leaves the heart through the pulmonic valve.
When your baby is 28 weeks old (the start of the third trimester) his organs are fully formed and visible on the ultrasound. However, while they may be clearly visible, his organs' functions have not matured sufficiently for independent living. The baby is in the third trimester, if the baby were to be born he or she could possibly survive
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I'd like to help but the question is not clear....
could u edit the question and send it again.
Volcanic eruption would change the surface the quickest