If the cell membrane were not selectively permeable, then unwanted substances would transfer through instead of being blocked out. Think of it like this: you have a sifter with various sizes of spice in it. You only want the finer grains of spice in your food, so when you shake the sifter, the larger pieces of spice don't fit through the small holes that only allow fine grains. Then you are left with the small spices in your food and the large ones stuck in the sifter.
Hopefully this helps and I wasn't too confusing :)
The media plays a very important role as a source of information,education and entertainment, whether it is radio, movies or TV. It accommodates the world in to a single village which is saturated of media-information, that cause us to wear what we do, drink what we drink and eat what we eat.
Alcohol and drug abuse, certain medications, and viral infections may lead to Non-cardiogenic pulmonary edema. Exposure to either of these could contribute or increase the chances getting Non-cardiogenic pulmonary edema.
Answer:
All the answers are right because all of these occurs in meiosis