Fresh pineapple prevents gelatin from setting up because it contains a protease called bromelain that digests the links formed between collagen molecules that make the liquid turn into a gel. Canned pineapple doesn't have the same effect because heat from canning inactivates bromelain.
The United States has few reserves and a very high consumption rate.
Explanation:
If the United States keeps using fossil fuels, they will run out very quickly and an alternative will be needed, the second answer choice supports that.
