Yes, you can. :)
Yes
Yes. Yes you can.
Your question does not contain enough information for anyone to answer it. You need to say what you are using the vegetable oil FOR in your question.
Yes, but don't drink it.
that is stupid. No u can't ^^ actually YOU'RE stupid, yes you can.
yes
You could use vegetable oil to run your car IF it is a diesel. It is not necessarily greener than diesel fuel due to the energy used to produce and transport the vegetable oil.
you can but when it blooms it will droop and wont be as nutritous
Yes; any light vegetable will work.
You can use vegetable oil instead of olive oil however olive oil is generally added to recipes for it's taste plus its much healthier for you, but you could use vegetable oil. Think about it this way, you use vegetable oil to cook your chips right? So thierfore it can be used for cooking in food, but think how your chips taste when you leave too much oil on them - that's the taste you'll be adding to your recipe, but, if your going to do it - try be sparing with it or add extra herbs / spices to cover the taste.
yes you can. But if you do use it use it half less then the vegetale oil because canolio oil is more greasier than the vegetable.