Answer:
The baby starts breathing
Explanation:
While in the womb, a fetus has its oxygen delivered to it, and the waste products removed (all via the mother's bloodstream), so there is no reason to separate all the chambers of the heart while still in the womb.
However, once the baby is born and it is breathing, the chambers need to differentiate in order to allow the blood to reach the lungs, and the oxygenated blood and deoxygenated blood do not mix.
Folate and postassium are common shortfall nutrients.
Teens’ use of most illegal drugs is down—way down—except for marijuana (which is the most common drug taken in the US by teens), which is staying about the same. However, teens are vaping more often than before, and their use of inhalants has increased slightly.
Those are some of the findings from the latest Monitoring the Future survey. More than 43,700 students in 8th, 10th, and 12th grades (from 360 schools across the United States) took the survey in 2017. Here are some of the things we learned from them.
The good news is overall, teens’ use of illegal drugs (other than marijuana and inhalants) continues to decrease. It’s now the lowest in the history of the survey in all three grades. That’s excellent!
