If fossil fuels continue to be used at their current rate, which will probably be used up first? o natural gas
oil
coal​

hope this helps some

Explanation:

The theory that explains how this could have happened is called endosymbiotic theory. An endosymbiont is one organism that lives inside of another one. All eukaryotic cells, like your own, are creatures that are made up of the parts of other creatures. Mitochondria, the important energy generators of our cells, evolved from free-living cells.