Can you substitute vegetable oil, in place of olive oil?

Yes. Canola oil is a vegetable oil, along with peanut, corn, coconut, safflower, etc.

Yes, make sure the sap is completely saturated with olive oil. Apply it for 15-20 minutes. Then, wash your hair with shampoo gently.

Yes, chapathi can be made without olive oil or ghee, as is your preference.

You can, but coconut oil is best.

This would work, although true ferrofluid is not just iron oxide and vegetable oil.

Absolutely, you can use corn oil instead of vegetable oil, there's not a huge difference, so it won't change the recipe.

Olive oil will probably make your lip gloss too runny and possibly chunky. If you don't have Vaseline you could try coconut oil, Waxelene, Alba Un Petroleum, or Jao Brand...

Soapcalc.net will give you the complete recipe when you plug in these amounts.

You can use soothing oils. That is no problem. Your problem may be happening because the soap is washing away natural oils from your body which make you dry. They...

You could, but depending on the specific type of oil you use, it may alter the taste and consistency slightly.