8: this model is similar to a real life model because it shows what you can have in and around your house
9: the way this model can be useful is by helping show how to build your house the way you want it to be and what you would want
If you could tell me what cell it would be easier. Sorry I have to post it on Answer but I't does not show the commentary or whatever you guys call it.
The answer would be 502 grams because of the law of conservation of mass, you can't create or destroy mass so then 2 grams plus 500 grams is 502. I am 100% positive that B is correct.
The process used on dolly was called nuclear transfer. Hope this helped!!!