The fossil fuel which come from fossilized plant material is oil/petroleum. The natural gas example methane is obtained when heat is applied to oil. The fossil fuels formed from both fossilized plant and marine organisms, but most fossils fuels are formed from dead plant buried with little or no oxygen.
If you have a fizzy drink or acidic drink before brushing 5 mins later your enamle instantly disolves
It is called mode I think
Scientific resolution important mircoscope samples