Answer: white blood cells
Explanation: They fight off the bad bacteria.
<span>This is a very simplistic question because the distinction was clearly maintained in real life and that was only carried forward into Shakespeare's plays. The most obvious difference between people of different social classes was their clothes. People were forbidden by law to dress in certain ways unless they were rich and noble enough. The costumes used in the plays showed this: the actors playing noble people wore fine clothing (the castoffs of the real nobility).
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</span><span>The other difference between the upper and lower class people is the way they talk. Shakespeare often puts a stately blank verse in the mouths of the upper crust and arrhythmic prose in the mouths of the common people. But not always. Even the nobility speak in prose when they are disturbed or insane, and they speak in prose all the way through Much Ado About Nothing. Prince Hal talks in prose when talking to Ned Poins. Blank verse is saved for matters of seriousness where a more poetic approach is needed. It is not, therefore, a matter of social class so much as a matter of the weightiness of what is being said (and in Shakespeare, the lower classes rarely have anything worthwhile to say).</span>
Oxygen and nutrients from the mother's blood are transferred across the placenta to the fetus through the umbilical cord. This enriched blood flows through the umbilical vein toward the baby's liver. There it moves through a shunt called the ductus venosus. This allows some of the blood to go to the liver.
A small amount of the blood continues on to the lungs. Most of this blood is shunted through the ductus arteriosus to the descending aorta. This blood then enters the umbilical arteries and flows into the placenta. The oxygen rich blood then returns to the fetus via the third vessel in the umbilical cord (umbilical vein). The oxygen rich blood that enters the fetus passes through the fetal liver and enters the right side of the heart.
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