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, you can use canola oil instead of vegetable oil when making brownies.
Yes
Yes, you can. :)
A suitable substitute for vegetable oil when baking is to use butter instead.
Yes. Yes you can.
Yes, but don't drink it.
that is stupid. No u can't ^^ actually YOU'RE stupid, yes you can.
yes
can corn oil be used instead of vegetable when grilling a steak
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.