I'm not sure what you mean by this but here is a diagram of a nephron!! Hope this helps?
Answer:
The answer is due to oxygen deficiency
Hope this helps you.
Placenta
It also does not allow the maternal and fetal bloodstreams to mix
Answer:
About 100 times more than other planets.
Explanation:
The Sun would be about 100 times bigger than the earth planet in the scaled-down model of the solar system because in the reality the size of sun is 109 times more than the earth so making a model more perfect and nearer to reality we have to maintain the diameter of the sun more than 100 times than the earth and other planets.