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 :)
Once a hypothesis is tested and confirmed, and then tested again and confirmed again by many others, it may provide the basis for, or become a part of, a scientific theory.
Measurements would be everything that is not an instruction. To sum that up, everything in the left should be circled EXCEPT makes 3 loaves
A.) Liquid is measured in mL so everything with mL is a liquid 826mL+80mL+158mL= 1,064 mL
B.) Dry items are measured in g so everything ending with g is dry item 14g+7g+120g+1,135g= 1,276g
